This reminds me of Patrick Rothfuss' The Wise Man's Fear... seems that his dad told him a similar story :-)
> “Once upon a time,” I began. “There was a little boy born in a little town. He was perfect, or so his mother thought. But one thing was different about him. He had a gold screw in his belly button. Just the head of it peeping out.
> “Once upon a time,” I began. “There was a little boy born in a little town. He was perfect, or so his mother thought. But one thing was different about him. He had a gold screw in his belly button. Just the head of it peeping out.