An elderly Jewish gentleman is sitting opposite a priest on a train. "May I ask, why do you wear your collar back to front, young man?"
"Because I'm a father," answers the priest.
"I'm also a father and I don't wear my collar like that."
"Ah," said the priest, "but I'm a father to hundreds."
"In that case, if I may say, maybe it's your trousers you should wear back to front!"