George

'scuse me. I uh, I was in here this morning and uh, I believe I paid you with a twenty dollar bill, (smiles) but you only gave me change for a ten.

Cashier

I don't think so.

George

Oh, I think so, and I can prove it. You see, I was doodling on the bill and uh, so if you have a twenty in there with big lips on it... well, (smiles) that's mine. Would you mind opening up the register?

Cashier

Not unless you buy something.

George

Fine, I'll buy a pack of gum.