Riddle: A bus driver goes the wrong way down a one-way street. He passes the cops, but they don’t stop him. Why?
Answer: He was walking.
Riddle: If an electric train is traveling south, then which way is the smoke going?
Answer: There is no smoke—it’s an electric train.
Riddle: Poor people have it. Rich people need it. If you eat it you die. What is it?
Riddle: David’s father has three sons. Two of them are named Snap and Crackle. What is the third son’s name?