Or how 'bout the kid who was born just a head, no body.
So his parents are at a cocktail party, and they ask this guy what he does, and the guy says "I'm a research biochemist, we're working on a method to regenerate missing limbs."
Then the dad says "our son is just a head, will you be able to possibly generate a body for him," and the biochemist says "if the formulae work out, we'll be able to generate a whole new body for your son."
So the parents run home to tell Junior the hopeful news, they go in the house, go to the little head's bedroom, turn on the light, walk over and tap him on the head saying "son, son, we have a big surprise for you."
Then he opens his eyes, looks up at them, and says "let me guess, another hat?"