Stewie, to Lois: Mother, life is like a box of chocolates. You never know what you're going to get. Your life, on the other hand, is like this box of active grenades!
this may sound a bit lame, but my favorite quote was from Toy Story:
(Woody, just waking up from spending the night in the toy chest): Who's got my hat? (Toy Shark pops up right next to Woody, wearing the missing hat): Hey, I'm Woody! Howdy howdy howdy! (Woody, pretending to laugh): A ha, A ha... Gimme that! (promptly snatches hat off shark's head)