The mugger
Two guys are walking home from a bar when a mugger approaches them in an alley with a knife and demands their money. They both grudgingly pull out their wallets and begin taking out their cash. Just then one guy turns to the other and says, "Hey, here's that $20 I owe you."
A mugger
Late one night, a mugger wearing a ski mask jumped into the path of a well-dressed man and stuck a gun in his ribs. "Give me your money," he demanded. Indignant, the affluent man replied, "You can't do this, I'm a United States Congressman!" "In that case," replied the mugger, "give me MY money."