When this story is amusing (excerpted and paraphrased from Wise Man's Fear by Patrick Rothfuss):
A baby boy is born with a golden screw for a belly button. When he is old enough to realize that this is unusual, he asks his parents why he has a screw for a belly button. They do not know. When the boy becomes a young man, he goes out into the world looking for an answer. He asks physicians, magicians, scientists, priests, merchants, carpenters, and kings. No one knows. Finally, he comes the wisest king of all. The king examines the golden screw then sends a boy off to fetch a golden box. The king pulls out a golden key and opens the box. Inside is a golden screwdriver. The king puts the screwdriver to the golden screw and turns. The boy's ass falls off.