'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 the dollar.
'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; he says to the boy; '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's over!'
Moral: When you think the other person is dumb, very likely you may be making a fool of yourself.