I answer this very important question over at Babble.
An adult and a baby make a great comedy team. Case in point: The Hangover. Babies are the perfect comedy foil; they’re always the object of the joke and seldom its source. Therefore, it’s funny to say you want to eat them. The stupider an adult acts around a baby, the more fun for everyone. This is why your parents, if they were any kind of parents at all, have a photo of you sleeping in a high chair surrounded by empty beer cans.