When my father was 31 I was 8. Now he is twice as old as me. How old am I?

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

What kind of band never plays music?

Can you discover the missing number in this series?

37, 10, 82
29, 11, 47
96, 15, 87
42, ?, 15

What demands an answer, but asks no questions

The dirtier I get, the whiter I look. Who am I?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

John speaks the truth only once a day in a week. Below are a few hints for you:

First: Days are Sunday, Monday and so on.
Second: One day he says, "I lie on Monday and Tuesday".
Third: On the next day, he says, "Today is either Thursday, Saturday or Sunday".
Fourth: On the next day, he says, "I lie on Wednesday and Friday".

Can you identify the day on which he speaks the truth?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

Can you name an animal whose killing cannot be performed without spilling your own blood?