I tried --unsuccessfully -- to join the cult of the beturners, folks who buy something with the explicit intention of using it one time and returning it. It's part stealing, part retail-borrowing, and pure evil. We all know about beturning, but no one likes to talk about it.
Let's face it, not every interaction or transaction will go off without a hitch. However, the way you handle these opportunities in disguise will be a driving factor in customer loyalty and return/referral business.