To good

A young boy enters a barber shop and the barber whispers to his Customer,
"This is the dumbest kid in the world. Watch while I prove it to you."

The barber puts a five rupee coin in one hand and two one rupee coins(1+1=2) in the other, then calls the boy over and asks,
"Which do you want, son?"

The boy takes the two one rupee coins and leaves.
"What did I tell you?" said the barber. "That kid never learns!"

Later, when the customer leaves, he sees the same young boy coming out of the ice cream store. "Hey, son! May I ask you a question?
Why did you take two one rupee coins instead of five rupee coin?"

The boy licked his cone and replied,
"Because THE DAY I TAKE THE FIVE RUPEE COIN, THE GAME IS OVER
 

Moral : When you think the other person is dumb, you are making a fool of yourself..