This jewish guy, in the practice of circumcision, had this whole
jar of foreskins that he had kept throughout the years as momentos.

He took them to a leatherworker and asked him what he could do with
them, and the leatherworker said, "Come back in two days."

So the Rabbi came back and the leatherworker gives him a wallet.

"One lousy wallet, that's all you could make out of that whole jar?"
the Rabbi asks incredulously.

"Well," the leatherworker says," you rub it a little bit, and it turns
into a briefcase...."