here is a mind teaser for you.
You find yourself in a room with 2 doors and a guard standing in front of each door. One of the doors leads to freedom, the other door leads to instant death. You MUST choose a door to go through. To help you choose your allowed to ask ONE guard a question. Only 1 question and to only 1 guard. The problem here is, one guard ALWAYS lies and one guard ALWAYS tells the truth BUT you don't know which guard is which.
So now you have to ask your question to one of the guards to find out which door leads to freedom.
What would your question be.
I'll ask one question to start this off:
I ask the guard standing in front of one of the doors: Is your door the door that leads to freedom?
the guards responds yes BUT I don't know if he is the guard that always tells the truth or always lies and now my question is gone. I loose.