This may sound weird to you, but my favorite part is when Boo gets the Little Mikey bear and when Mike takes it away, she starts screaming. I thought it was funny how Mike named a teddy bear after him. Also, when she starts screaming, and Sully tries to cheer her up, then that whole “AHH! SHE TOUCHED ME!” and “SULLY the bear!” and Mike makes her laugh.
The greatest part in my quite humble opinion was when monster-i-fied Boo started hanging out with the monster children, and when asked her name, she replied “MIKE WAZOWSKI!!” and all the children repeated her.
With regards to that scene, MY favorite part there is when Boo starts screaming, and Sulley makes the mistake of trying to use adult logic on a two-year-old(a technique which is proven to be highly ineffective), by telling her, “he’s(the Teddy bear) not crying, so neither should YOU!” That never worked for my grandmother, who used to try it with me when I was a little kid, so it’s no wonder it failed miserably with Boo!
I love that bit too, Pixelated! And the next scene when Sulley’s getting all upset about Boo having been supposedly crushed in the rubbish thing, and he says that he can still hear her little voice. When Mike agrees (because the little kids are all running around and shouting ‘Mike Wazowski!’) and asks how many kids he’s got in there, I always laugh.
I’m not sure I can pick a favorite part. I liked the company play pun though. Also, the scene in the house with Boo was kinda cool. I hearted the whole movie though.