The centre of the third figure is empty. What digit should fit inside?

Identify the hidden meaning behind this picture?

Outside a massage parlour, there is a board that reads
"I only massage those who do not massage themselves."

Reading the above statement, does the masseur massage himself?

What animal walks on four legs in the morning, two legs during the day, and three legs in the evening?

Oedipus, the king of Thebes, figured out the answer to the riddle:

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?

If 1+9+8=1, what is 2+8+9?

Who has married many women but was never married?

What always comes into a house through the keyhole?