Change-purses Jokes

A mohel was in the unsual habit of saving the foreskins from the babies he circumcised. Everyone thought this was evidence enough that the old man was deranged. When they found out that he wasn't just saving them, but sewing them into miniature change-purses, they were ready to call for the men in white coats.
The mohel insisted, though, that he was in full possession of his faculties. "I'm just being practical," he said. "They're the most useful change-purses in the world. Just watch! You rub one, and it turns into a suitcase!"