An old Johnny Carson clip popped up in my Facebook feed tonight. It was a logic puzzle for three men to figure out. A hat is placed on each man's head. They are told that each hat is either red or black. You can see the other two men's hats but you cannot see your own hat. The men are instructed to raise their hand if they see a black hat on either one of the other two men. All three men raise their hands and you can see that each of the other two men is wearing a black hat. What color is your hat and how do you know?