Riddle: You are walking down the road trying to get to Truthsville. You keep walking until you hit a fork in the road with a guy standing in the middle. Now one road from the fork leads to Truthsville and the other goes to Liarsburg and the guy is from one of these towns and he says he will let you ask him one question. What do you ask him to get him to take you to Truthsville?
Answer: You ask him to take you to his village. If the guy is from Truthsville, you will be lead to Truthsville because it is the truth. If the guy is from Liarsburg, you will be lead to Truthsville because it would be a lie.