Ice Age

— Hey, he's wearing one of those baby thingies.
— So?
— So if he poops, where does it go?
— Humans are disgusting.
— Okay, you, check for poop.
— Hey, why am I the poop checker?
— Because returning the runt was your idea. Because you're small and insignificant. And because I'll pummel you if you don't.
— Why else?
— Now, Sid!