Everybody has heard of the story where two guards stand by two doors, one leading to unimaginable wealth and the other to instant death, where one guard always tells the truth and one always lies. You are allowed to ask one question, to figure out which is the right door.
However, when you arrive at the doors, cursed fate should have, it turns out somebody got the story all wrong, and there is only one guard! This guy either always tells the truth or always lies. Since he's there all alone he's very happy with your company and won't just let you go away. He insists (playing peacefully with his sword) that you ask him a question and choose a door.
What do you ask the guard to save your life?
Good luck!