Another thing that makes me laugh as of now:
In the second theatrical trailer for Inside Out, when all the emotions scatter to try and avoid the brain freeze but then they get iced up…with funny-looking faces! 
In a weird kind of way…that part in Ratatouille where everyone in the ktichen all go after Remy to kill him kind of makes me laugh.
Like, there’s one of him, and he’s the size of one of their fists. Them all going after him like that is overkill on so many levels.
In the same vein, the old lady reacting to two rats with a shotgun. It’s like everyone but Linguini in this universe has a rat phobia except worse.
Also, in A Bug’s Life, when the kid ants are putting on a play, one of the ants playing an ant has on this hilarious little angry face the whole time.
And in regards to the cinder-blocks, the commentary mentions that they like how it shows off his strong he is, so exercise seems likely.
Speaking of all things Ratatouille, I think that the scene where Remy is running and he notices a fighting couple that then makes up with a hug and a kiss after a gunshot puts a smile on my face.
There are a lot of Pixar moments that make me laugh, so many in fact that I could fill up a whole page, but one that stands out is during the scene in Ratatouille where Linguini is trying to explain to Colette that he isn’t the one cooking and that Remy is. At one point in the scene, Linguini says “I have this tiny little…” and Colette looks down for a sec I didn’t notice it till recently but I totally get it now
I know another scene from Inside Out that made me laugh recently:
“Congratulations, San Francisco! You’ve ruined pizza! First the Hawaiians…and now you!”
^ Inside out was a pretty funny movie! I especially appreciated all the little jokes to psychology. Like the Train of Thought, Deja Vu, Opinions vs. Facts, and such. Little touches like that are fantastic.