I had a customer storm in one day demanding to know why we'd charged his card x amount
And he was furious when we told him that he'd left without paying his tab, so had collected the money anyway under the slip he'd signed beforehand.

He was under the impression that if he walked out, then that tab was invalid. Stupid cunt.
( Methylene Blue - electrohead, Thu 11 Jun 2009, 0:46, archived)