A Polack and a Jew are riding together in the same train and start chatting.
“How is it possible,” asks the Polack, “that you Jews are so successful in business?”
“It is simple,” replies the Jew. “We have good-luck charms.”
“What are they?” asks the Polack.
“Well,” replies the Jew, “it is something we carry with us all the time that brings us good luck.” And he pulls a plastic bag out of his pocket and begins to unroll it. Inside is a fish head.
“Wow!” says the Polack, poking the fish head. And he asks if the Jew is willing to sell it. “Twenty dollars and it’s yours,” replies the Jew.
The Polack hands over twenty dollars and pockets the fish head. But ten minutes later he is upset. “I have just realized,” says the Polack, “I could buy at least ten fishes in the market for twenty dollars.” “Aha!” says the Jew. “You see, it’s working already!”
