Answer:
How can you throw a ball 20 meters, and have it come back to you without hitting anything?
A claustrophobic person gets on a train. The train enters a tunnel just as it is leaving the station. Where is the best place for him to sit?
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?
What is yours but only used by others?
What was the longest river in the world before the Amazon River was discovered?
What is it that makes tears without sorrow. And takes its journey to heaven?