Last week I got a letter from the bank saying that I owed them $73 for rental on a safety deposit box that my wife apparently took out while I was in Iraq. It was free at the time, but apparently there had been some unannounced change in the policy. I called them to ask that the unannounced fees be waived, and they were intransigent on the phone. "Well, I'll come in and discuss it with you when I bring in the keys," I said.
At the end of that discussion-in-person, they agreed that they would waive the whole $73 and furthermore pay me $4.60 in return for accepting my keys and canceling the contract. I'm not sure if it was my charm, courtesy, or motorcycle jacket.