Answer:
What goes up the hill and down the hill, And spite of all, yet stand still?
On Christmas eve, when Santa leaves his workshop on the north pole, what direction does he travel.
How can you throw a ball 20 meters, and have it come back to you without hitting anything?
If you count 20 houses on your right going to the store and 20 houses on your left coming home, how many houses did you count?
A train just leaves a station and enters a tunnel. Where is the best place for a claustrophobic person to sit?
Who makes it, has no need of it. Who buys it, has no use for it. Who uses it, can't see it. What is it?