What if we all listed the funniest scenes from every Pixar film right here on this topic?
I’m glad I mostly watch all those Pixar films-for laughs!
Hmm… let’s see… it might take me a while to list every funny scene in every Pixar film. But I’ll kick off with one of my all-time faves from Ratatouille! One of my favorite scenes is probably when Skinner completely starts going on about the so-called “rat conspiracy” in front of his lawyer. Makes me start cracking up every single time I watch it! “The rat’s here! The rat’s there! OooOOOOOoooo!!!”
“Should I be concerned about this… about you?” 
Definitely more to come…
In the incinerator scene from Toy Story 3, I love that the only character who can’t find something made of metal is Rex.
I don’t know why, but the scene where the kids in the Caterpillar Room at Sunnyside are playing with the toys in Toy Story 3…just the thought of it makes me crack up. There’s just something so funny about Buzz being frozen with that smile on his face as he’s being bounced up and down as a hammering toy. 
Other funny scenes include Anton Ego’s childhood flashback, Lightning McQueen winning by a tongue, Francesco’s mom, Captain McCrea reaching for his Coffee, and pretty much half of Up.
In terms of feature films:
The toy rivalry between Buzz and Woody in Toy Story.
The scene in Ratatouille that goes like this:
“You! Get out of my office!”
“He’s not in your office. You are in his.”
I also like:
“I’m not your puppet, and you’re not my puppet-controlling guy!”
From The Incredibles:
“We survived but were dead!”
“Honey! Where is my super suit?!”
“Hey, look! I’m the Dash! The Dash likes.”
“No capes!”
I also like the scene from Up where Carl’s hearing aid keeps screeching:
“Darn thing!”
…followed by when Russell complains:
“I’m tired. And my knee hurts.”
“Which knee?”
“My elbow hurts, and I have to go to the bathroom.”
Well, how about this scene from Toy Story 2:
The one where Woody blames Jessie for turning on the TV, and then they get in a fight.
In terms of short films:
The shock scene in Presto
The scene in Mike’s New Car where Mike Wazowski is yelling:
“Don’t just sit there! Push the button!”
How about this scene from Jack-Jack Attack?
“Mrs. Parr, it’s me. Jack-Jack is fine, but weird things are happening! And you need to tell me what to do, 'cause I’m…”
I also like the scene where Jack-Jack bursts into flames, and Kari freaks out!
Oh, and the scene in Mater and the Ghostlight where Mater is doing some pranks.
That’s about all I can think of right now…
Dory’s “I shall call him Squishy and he shall be mine.” ROFL It just sounds so random it’s hilarious.
Buzz’s nervous breakdown screaming “DO YOU SEE THE HAT? I’M MRS. NESBIT! HAHAHAHAHA!” Then Woody slaps him and it makes a squeak sound on his stunned face. I’m just trying to suppress my laughter thinking about it right now!
When Helen’s on the phone with Edna and Edna suddenly yells “DAAHHHHRLING!” 
I agree about Skinner’s rant- that “oooOOOOOOooo! OOOOH it’s HERE! NO it’s over THERE! Am I crazy?” Yes, Skinner, you are. That was hilarious in the trailer and still hilarious in the movie!
Barbie tearing apart Ken’s clothes! I burst out laughing when they zoomed out and showed Ken in his underwear tied to a ping-pong paddle. And this sounds weird, but the way he squirms! xD I have a new respect for Barbie now. (At least, Pixar’s version.)
Buzz in Spanish Mode (or Romantic Mode is more like it)! When he grabbed Jessie and twirled her and did random dance moves all around her. And she’s just standing there smiling awkwardly. Okay, when Buzz started walking around her sideways in a protective circle, I couldn’t not laugh!
When Sully first sees Boo and she’s babbling randomly and he’s really freaking out xD. When she put on the Monsters, Inc. worker hat and said “I Tigger!” was hilarious!
And when Mike and Sully were screaming and running away from Boo in their own living room! Mike in scuba diving gear and armed with the spray…then when he later sprays himself in the eye! Oh, poor Mike! xD
When Heimlich pretends to be a worm to distract the bird- then he gets stuck in the crack! The watching ants are gasping, “How heroic!” while Heimlich’s screaming in a hilarious way.
“I’m the only stick with eyeballs!”
That poor bird in Partly Cloudy when he tries to handle the baby crocodile (or was it alligator?). He still opens his beak wide open to scream WHILE it’s in the baby’s mouth!
So much of For the Birds. All that squeaking xD And when the big bird just bursts out singing a cheerful, loud (jazz?) tune while the others are squeakily yelling at him.
And Jack-Jack, espcially when he’s screaming happily whenever he pops up somewhere. Like when he showed up behind the vase, or was floating without a diaper around on the house xD
From Brave,[spoil]Merida’s little brothers as bears. I saw that coming, but they look so cute and funny with their huge round heads on tiny bodies, running around. I especially liked how they fetched the key…oh goodness xD.[/spoil]
Ken and Barbie’s “experiment”. “I” “Love” “You”. “OOH!” “See what I mean? It changes every time!” “You are so smart!” xD Ever known couples like that?
When WALL-E casually puts his tire on M-O’s face to see how he’d react and M-O screams and wipes his face, panicking. WALL-E was just so random putting his “foot” on someone’s face!
This is a great thing to discuss! Brings back the laughter!
I lose it on the bit from Ratatouille where Alfredo goes into the pantry with Remy and shows him all the bite marks and all he can do is yell at him. Like that’s it. He’s just standing there screaming at this little rat who bit him to pieces omg.
but basically everything Alfredo does is laugh-worthy, poor thing. xD
little chef
Here’s a new one: I love the part in Toy Story 3 when the gang is making their escape and Buzz does a lovely job at getting them outside the fence, all while using his newly-acquired Spanish side to show off his awesomeness to Jessie… and after his success of opening the trash chute door, he proclaims in Spanish
“It is open.”
Oh, there is no way that Jessie can resist him now…
Finding Nemo: “Weeeeee neeeeed tooooo fiiiiinnd hiiiiis soooooon! Caaaaaan yoooou giiiiive uuuuuus direeeeectiooons?”
Ratatouille: “Employees must wash hands”
WALL-E: When EVE hands WALL-E the Rubik’s cube
The Incredibles: “No cape!” scene
Monsters inc.: “We’re out of snow cones!”
More for me:
-The bathroom scene in Cars 2
-“No capes!”
-Russell ending up on Carl’s front porch…and he’s like: “What are you doing out here, kid?”
-“I found the snipe!”
-Pretty much everything Dug says (“Stop, you dogs!”)
-The ones with Spanish Buzz
-“Uh, Buzz? Barbie didn’t write this.”
For some reason I always crack up when Russell says ‘SAND… I’ve found sand!’ for absolutely no reason other than noticing the mentioned sand in Up, from when before he and Carl enter the jungle, I think.
Also, an oldie but goody from Toy Story;
“YOU ARE A TOYYY! You’re not a space ranger, you’re a child’s plaything!”
“…You are a sad strange little man. You have my pity. Farewell.”
I think it’s Woody’s exaggerated body language that gets me, ahahaha
When the Captain wakes up and then suddenly yells, “All hands on deck!”
–and–
When Kevin is calling to her babies and Russell’s like, “Kevin’s a girl?”
–and also–
When Mr. Potato Head is a tortilla and gets attacked by the pigeon
–and then–
When Lightning McQueen tells Mater, “I lost the race because of you!” (During dream sequence–when he’s being laughed at)
–and finally–
When the table is knocked over and Fergus yells, “Boys!” (Because the triplets tied his leg to the table)
i think its most of the first toy story.
Ok, I think I’ve got some new once for the list:
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Captain McCrea’s “Uh” (and the computer accepts)
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“I killed a man… with this thumb!” (and the other wild backstories)
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Remy gets caught making soup
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Linguini with sunglasses
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Elinor attempting to eat berries with twigs as utensils, while in bear form
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Having to use the kilts to get down form the tower
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[spoil]“Cute-ma Kappa”[/spoil] (you’ll probably get me for this one)
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[spoil]The initiation scene/ Mrs. Squibbles washing[/spoil]
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[spoil]Everytime OK has a balloon pop[/spoil]
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[spoil]“I can’t go back to jail!”[/spoil]
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[spoil]Art overinflated after touching various glowing urchins[/spoil]
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[spoil]The Scare Pig chase[/spoil]
I’ll probably come up with more in the future. 
I just thought of one:
That one scene in Toy Story of Terror when Woody and Buzz see Mr. Potato Head’s arm–the arm keeps pointing up at something and they’re making different guesses about what it’s trying to say:
“Three syllables, uh…once upon a time!” “One plus one is one!”
Toy Story - Someone already said Mrs. Nesbit, so I’ll go with when Buzz says he’s set his laser to kill. “Great, so if anyone attacks us, we can blink 'em to death.”
A Bug’s Life: “My children’s children will walk down the street and people will point and go ‘Look! There goes the spawn of Flik, the loser!’”.
Monsters, Inc.: When Mike and Sulley think Boo was crushed, then a bunch of kids wander by saying Mike’s name and he wonders how many kids are in the cube.
Finding Nemo: “Dory, this is not whale, you’re speaking, like, upset stomach.”
Cars: “I know this might be a bad time right now, but you owe my fifty two thousand dollars in legal fees.” “What?”
Ratatouille: “Anyone can cook!” “Anyone CAN, that doesn’t mean that anyone SHOULD.”
WALL-E: EVE shooting the screen in the elevator.
Up: “I was hiding under your porch because I love you.”
Toy Story 3: When they first showed Chuckles the look on his face left me laughing throughout the tragic back story.
Cars 2: That thing with Francesco’s mother before the first race.
I think the one scene that made me laugh the most in my favorite Pixar movie: the Incredibles:
Syndrome: And got… BIZAY!!!
When Mater screams after eating the wasabi, mistaking it for pistachio ice cream:
“Somebody get me water! Oh, sweet relief. Sweet relief.”
And then he tells everyone not to eat the “free pistachio ice cream”.
I also really enjoy the scene where, when Stu is flicking so many of the switches in frustration, he seems to have gotten one right for just brief moment… (You might wonder what I mean!)
Toy Story:
“BUZZ, LOOK! AN ALIEN!”
“Don’t you get it??? You see the hat? I am MRS NESBITT! Whahahaha…”
“Hey, look Hamm, I’m Picasso!”
“You uncultured swine!”
“Saturday’s Plastic Corrosion Awareness meeting was, I think, a big success…”
“We’re not flying, we’re falling…with style.”
“I don’t think I could take that kind of rejection!”
A Bug’s Life:
“I’m…OK!”
Many of the circus scenes
I can’t remember that much…
Toy Story 2:
“Oh, I get it…there’s a snake…in my boot”
Stinky Pete’s reaction to “anyone seen my pick?”
Bullseye’s reaction to his introduction in Woody’s Roundup
The toys reacting to “I’m going to let go of the wall”
Bullseye licking Woody
Buzz’s patriotic speech
Slinky helping Buzz and the gang off the roof - then diving off holding his other end
“No…I AM YOUR FATHER” and the accompanying “NOOOOOOO!!!”. Tim Allen gets that line perfect every time
“Go long, son” from Zurg
"I…FINALLY DEFEATED ZURG! " “Father…”
Buzz’s awkward wing…thing…know what I mean, Vern?
Monsters, Inc.
“PUT THAT THING BACK WHERE IT CAME FROM, OR SO HELP ME!”
Mike’s burp and stand-up routine
When Mike falls into the bin and is squashed by the books
I need to watch this film again…
Finding Nemo
“Hey Mr Grumpy Gills” - this line is absolutely hilarious. It’s the way Dory floats on screen
“WEEEEE NEEED TOOOOO FIIIIND HIS SOOOOOON” and then all the different dialects
Marlin’s reactions to Dory in general - Albert Brooks is a great actor and it’s a shame people don’t associate him more with Pixar and talk about him more
“That’s not a duck! It’s a…PELICAN!”
The pelican guy in general - I can’t remember his name
The yellow fish guy I find funny
“Sweet.” “Totally.”
“OK everybody, we’re going to have a great jump today”
“Coocoocachoo”
“'Juh”
“Sooooo…what brings you on this fiiine day to the E.A.C?”
“Hey dude…dude…he lives!”
OK, I’ll just say Crush and Squirt.
The Incredibles:
“Honey? Where’s my super suit?”
“WHERE IS MY SUPER SUIT?”
“YOU TELL MY WHERE I SAW THIS, WOMAN!”
“Mom! Dad! HEY!” from Violet
"We survived, but, we’re dead…
“You married Elastigirl? Oh - and GOT BIZZAY!”
Mr Incredible shutting his car door
Mr Incredible putting his back out and then it getting better
Mr Incredible getting stuck in the chute
Ratatouille:
“Nopety nopety noo”
“You-know-who-know-doo. Wacka-doo. Rat-a-tat-a-HEY!”
“Aaargh! Aaaargh! AAAAARGH!”
Linguini knocking Remy into the Seine and then the scene continuing once they’re both out
Listening to the bread
Horst’s stories
The whole sequence when Remy is helping Linguini cook in Linguini’s flat
The lightning scene - I love how Remy and Emile are all puffed out
WALL•E:
Every scene with M-O in it, really
UP:
Every scene with Kevin in it, really
Most scenes with Dug
Carl’s reactions to Russell
The whole ‘snipe’ rigmarole
Toy Story 3:
“There is no way out!” “Just kidding, door’s right over there”
Spanish Buzz
Mr Tortilla Head
Mr Cucumber Head
When Barbie gets the manual from Bookworm…“yeesh…”
“Barbie didn’t write this…”
Barbie heading off with Ken and Jessie’s thumbs-up in return
“I get the Corvette”
“That’s Mr Evil Dr Porkchop to you”
Woody’s first “reach for the sky”
“She’s using her witchy powers!”
Bonnie’s “she’ll never find us in here” while steadily lifting up Dolly
“Are you classically trained?”
“I’m not a girl’s toy! I’m not!”
“You’re an accessory!”
“And gimme my scarf back!”
Ken trying to do Kung-Fu
“That bit’s in Spanish”
Brave:
When the triplets recover the key
Fergus’s impression
Fergus knocking over the table
The dogs
One of the triplets mimicking Fergus
Elinor in bear mode saying “no weapons on the table”
Fergus rowing out after the boys
Monsters University
“I’m a dance major!” “…and I’m not.”
“I can’t go back to jail!”
“Does anyone want gum?”
Inside Out:
“See? D-A-N-G-E-R! Shortcut!”
“I will take you, but not you!”
“Hah! DIVERSION! Seeya, sucker!”
Bing-Bong playing his nose like a trumpet
“There’s déja vu…”
Bing-Bong mixing the box of facts with the box of opinions
Most scenes with Fear
Wee Dingwall: The pelican’s name is Nigel, and the yellow tang is Bubbles.
Oh! That one scene from The Good Dinosaur where:
Arlo and Spot eat the rotten fruit, then they hallucinate.