Riddle: You come to a fork in the road and a man is standing there. One way leads to truthtown and the other leads to lietown. you want truthtown.you know that this man is either from truthtown or lietown. people from truthtown can only tell the truth and vice versa with those of lietown. what is the one thing you can say that can get this man to show you the way to truthtown?
Answer: Tell him to point to which of the two paths he is from.