What is bigger than you but weighs nothing?
What has 4 legs, 1 head, and 1 foot?
When is a door not a door??
A man was about to die. He said to his three sons,” If you can fulfill my wish, you can have this house. I want you to fill up the room. The first son brought in straw but that was not it. The second son brought in sticks but that was not it either. The third son filled up the room but what did he use to make the old man happy?
How many letters are in the alphabet?
How is a king and a yardstick alike?