Barber and Boy

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 £5 coin in one hand and two £1 coins (1+1=2) in the other, then calls the boy over and asks, "Which do you want, son?"

The boy takes the two £1 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 £1 coins instead of £5 coin?"

The boy licked his cone and replied,
"Because THE DAY I TAKE THE £5 COIN, THE GAME IS OVER."

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