A Polish man was walking down the street, carrying a brown paper bag. He ran into one of his friends, who asked, "Hey! What do you have in the bag?"
The man tells his friend that he has some fish in the bag.
His friend says, "Well, I'll make you a bet. If I can guess how many fish you have in the bag, you'll have to give me one."
The man says, "I'll tell you what. If you tell me how many fish I have in this bag, I'll give you both of them."