Issy had never been on a train in his life. One lovely sunny day, he decided he would try a train ride. Off he went with his yarmulka on his head, a piece of salami under one arm and black bread and some herrings in a jar in the other. Suddenly a porter popped his head in and said, “Sir, you will have to leave this compartment. It’s reserved for the Archbishop of Boston.”
Issy replied, “Vell, how do you know I’m not de Archbishop of Boston?”
From Oy! The Ultimate Book of Jewish Jokes, by David Minkoff