Riddle: You are running through a forrest and a lion is 5 seconds behind you. You know that there are 2 tribes in this forrest; one tribe always tells the truth; the other group always lies and they are all cannibals. You come to a fork in the road and one person from the two tribes is standing there. You have time to ask one question, what question would you ask?
Answer: You would ask, "Which way should I go?" Because then they would both point to the way you should go. The bad person would lie and say to go the other way, and the good person would tell you to go their way.