Answer:
Two fathers and two sons are in a car, yet there are only three people in the car. How is this possible?
What is yours but only used by others?
What man can shave 10 times a day and still have a beard?
First I threw away the outside and cooked the inside then I ate the outside and threw away the inside. What did I eat?
If there are three apples and you take away two, how many do you have?
It is something you will never see again.