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.

There was a strange boy who was born before his father. How can this be possible?

A little girl goes to the store and buys one dozen eggs. As she is going home, all but three break. How many eggs are left unbroken?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

It belongs to you, but other people use it more than you do. What is it?

Which is the smallest number that you can write using all the vowels exactly once?

Can you spot what's wrong with the following sentence?

PETER WAS ANGRY AT
HIMSELF BECAUSE HE
ACCIDENTALLY LEFT THE
THE KEYS TO HIS CAR
AT HIS FRIEND'S HOUSE.

How many sides does a circle have?

Divide 110 into two parts so that one will be 150 per cent of the other. What are the 2 numbers?

I always drive my customer away.

Who am I?