Answer:
What goes up the hill and down the hill, And spite of all, yet stand still?
How many bananas can you eat if your stomach is empty?
An archaeologist unearths a coin bearing the inscription "57BC". How does he instantly know that it's a forgery?
How far can a man hike into the forest?
How can you place a pencil on the floor so that no one can jump over it?
What is it that makes tears without sorrow. And takes its journey to heaven?