In Greek mythology, the Sphinx sat outside of Thebes and asked this riddle of all travellers who passed by. If the traveller failed to solve the riddle, then the Sphinx killed him/her. And if the traveller answered the riddle correctly, then the Sphinx would destroy herself. The riddle:

What goes on four legs in the morning, on two legs at noon, and on three legs in the evening?

Oedipus solved the riddle, and the Sphinx destroyed herself.

The more you take me, the more you leave me behind.
Who Am I?

How could a baby fall out of a twenty-story building onto the ground and live?

What word is pronounced the same if you take away four of its five letters?

An ape is trying to climb on a pole that is 60 feet high. Due to the slippery surface, the ape climbs 3 feet in a minute only to slip back 2 feet.

How much time do you think the monkey will take to reach the top of the pole?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

Which English verb becomes past tense just by rearranging the letters?

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

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?