Answer:
A boy throws a baseball. It travels 40 feet and then goes right back to the boy. How is that possible?
What is the largest $ amount of change you can have in your pocket without having exact change for $1?
What is yours but only used by others?
Two fathers and two sons are in a car, yet there are only three people in the car. How is this possible?
What is the building that you leave without ever having entered.
What is always coming but never arrives?