Some more: I'm not an airplane, but I can fly through the sky. I'm not a river, but I'm full of water. What am I? In a tunnel of darkness lies a beast of iron. It can only attack when pulled back. What is it? In Okmulgee, Oklahoma, you cannot take a picture of a man with a wooden leg. Why not? In what year did Christmas Day and New Year's Day fall in the same year? Is an old hundred dollar bill better than a new one?