A business man is chatting with a hairdresser while shaving in a barbershop. At that time they see a child passing by the front of the door. The barber says,

This kid is the most stupid child in the world. Let me show you;  Jack, come here!

Then the boy greets the barber with a silly grin. The barber gets a $ 10 and a $ 100 from his pocket;

You can get whichever you want.

The child looks to the moneys and gets 10 dollars. The barber turns towards the businessman and laughs;

-Did you see? I told you, he does it every time.

After the shaving is over, the businessman goes out and sees the child a bit ahead and goes to his side;

Why did you get 10 bucks instead of 100 bucks?

The child has a cunning expression

If I get 100 bucks, the game will over!