Answer:
When can you add two to eleven and get one as the correct answer?
There are two sisters: one gives birth to the other and she, in turn, gives birth to the first. Who are the two sisters?
A boy throws a baseball. It travels 40 feet and then goes right back to the boy. How is that possible?
What is yours but only used by others?
Mr. Smith has two children. If the older child is a boy, what are the odds that the other child is also a boy?
By Moon or by Sun, I shall be found. Yet I am undone, if there's no light around