Okay heres an easy common riddle Tommy lives in a one story house. The color of his table is blue. The color of his chairs are blue. The color of his car is blue. What color is his stairs?
It's not hard! You need to feed a fire to keep it going. Anyone who touches it will turn red from a burn.
The man who invented it doesn't want it. The man who bought it doesn't need it. The man who needs it doesn't know it. What is it?