Over the course of his career, a doctor who performed circumcisions collected every foreskin he ever lopped off. As he neared retirement, he wanted something as a keepsake.

So one day, he takes a giant jar filled with foreskins to a leather worker. After the leather worker's initial shock, he asked the doctor what he wanted. "I don't know. Just make me something. Surprise me."

When the doctor comes back two weeks later, the leather worker disappears into the back and returns to the counter carrying a wallet.

"A wallet? That's it? Thirty years of circumcisions and all you have to show for it is a wallet?"

"Yeah. But if you rub it, it turns into a briefcase."