old Man in Pawn Shop

that’s what you think it’s worth.. you have a deal!”
“Great!” replies the pawn broker, shaking his hand.
“Here’s twenty bucks,” says the old man. “I’ll buy it right now!”
The broker stops, and suddenly looks confused. “Wait…. buy?” he asks.
“Yes!” smiles the old man as he flips the guitar over, “This one has a
sticker price of $150, but now that I have
your honest opinion I think twenty bucks is a great deal!”