I came across an entire client department with invalid Windows XP product keys.. Funnily, enough the department IT guys didnt realize that they had pirated Windows XP software.
Once we procured the actual Microsoft XP product keys, I had to explain to them that changing the Microsoft XP product keys on the desktops was an elaborate exercise..and I had another IT department head screaming about the dumb guys who would make it difficult to install legal software.
He even asked me whose side Microsoft was on..?