There were these three guys, a Polish guy, an Italian guy, and a Jewish guy. They all worked together at a factory. Everyday they noticed that their boss leaves work a little early. So one day they meet together and say that today when the boss leaves, they'll all leave early too.
The boss leaves and so did they. The Jewish guy goes home and goes to rest so he can get an early start the next morning. The Italian guy goes home and cooks dinner. The Polish guy goes home and walks to his bedroom. He opens the door slowly and sees his wife in bed with his boss, so he shuts the door and leaves.
The next day the Italian and Jewish guys are talking about going home early again. They ask the Polish guy if he wants to leave early again and he says, "No." They ask him why not and he says, "Because yesterday I almost got caught!"