One memorable day at work a POS Kodak system decided that it wouldn't store a particular record. Nothing worked. This happened a few times until it became clear that the only things these cases had in common was that the people's first names started BRE. I can remember a rather sad looking IT manager nodding with agreement having tried everything when I suggested we just get them to change their names. Bug is still there. It's just a historic archive now, thank god. Worst software ever.