Answer:
Three doctors said that Bill was their brother. Bill said he had no brothers. Who was lying?
No matter how terrible things get for the people of the Arctic, they will not eat a penguin. Why not?
10 fish are in a tank. 2 Drown, 4 Swim away, and 3 Die. How many are left?
How do you discover something that does not exist?
Two fathers and two sons are in a car, yet there are only three people in the car. How is this possible?
By Moon or by Sun, I shall be found. Yet I am undone, if there's no light around