The dumbest kid

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 you.
The barber puts a dollar bill in one hand and two quarters in the other, then calls the boy over and asks: 
- Which do you want, son? 
The boy takes the quarters 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 the quarters instead of the dollar bill?
The boy licked his cone and replied:
- Because the day I take the dollar, the game is over!