Answer:
How can you place a pencil on the floor so that no one can jump over it?
An archaeologist digs up two perfectly preserved bodies. He immediately identifies them as Adam and Eve. How can he tell they are Adam and Eve?
What can fill an entire room without taking up any space?
What is as big as you are and yet does not weigh anything?
How many bananas can you eat if your stomach is empty?
What did the piece of wood say when he saw the screwdriver and screws approaching?