Schwartz and Goldberg are two rabbis packing for a trip to Israel Schwartz has all of his clothes and is going to get a duffel bag. He asks Goldberg if he wants to borrow one. Goldberg declines the offer and instead pulls out his wallet made of circumcised foreskins. ""You're putting all of your clothes in a wallet?"" Schwartz asks. Goldberg replies,""Yes, but when I rub it, it becomes a suitcase.""