A boy and his father are caught in a traffic accident, and the father dies. Immediately the boy is rushed to a hospital, suffering from injuries. But the attending surgeon at the hospital, upon seeing the boy, says 'I cannot operate. This boy is my son.' How is this situation explained?

What question can you never answer yes to?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

How can one talk without saying a single word?

When is the top of a mountain similar to a savings account?

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

Jessica is telling her friends this story and asks them to guess if it’s the truth or a lie: “There was a man sitting in a house at night that had no lights on at all. There was no lamp, no candle, and no other source of light. Yet, he sat in the house and read his book happily.” Her friends say she’s lying, but Jessica corrects them and says she’s telling the truth. Jessica’s story is true—but how?

If eleven plus two equals one, what does nine plus five equal?

What can you catch but never throw?