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,
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"Because THE DAY I TAKE THE FIVE RUPEE COIN, THE GAME IS OVER
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Moral: When you think the other person is dumb, you are making a fool of yourself