What does below rebus means ?

Consider this: Arnold Schwarzenegger has a big one. Michael J. Fox has a small one. Prince doesn’t have one. The Pope has one but never uses it. Bill Clinton has one and uses it all the time. What is it?

What always comes into a house through the keyhole?

Why is 6 afraid of 7?

Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?

What has lots of eyes, but can’t see?

What time is it when an elephant sits on a fence?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

What is greater than gold but cannot be bought. it can never be sold and can earn if its sought. though it can be broken, it can still be fixed. for by birth it can't start nor by death it is ended.what am i?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?