You are held prisoner in a room with two other men. The guard is a ferocious man armed with a shotgun. He sits you down on a chair facing the wall and sits another man behind you and another behind him each facing the same way as you.
He has a bag with five hats in it- two white and three red. He puts a hat on each of you and tells you that he will shoot you all in five minutes. However, if one of you can go up to him and tell him what colour hat you are wearing and why and are correct, then he will let you free.
There are no mirrors or reflective surfaces in the room.
Notes: There is no trick behind this. It is a simple question or reason and logic. There are three known answers to this problem.