At one of my previous jobs (shift work in a NOC) there had been a bit of cleaning of dead wood, so one day people were talking and I made up on the spot that "Bob" had been let go last night did you here. It spun into a full blown rant and such, forgetting to tell them I was joking I left. The rumor persisted over the next couple days since both me and Bob were off shift. About 3-4 days later everyone was stunned when Bob came back into and when told they all though he was fired, the guy was extremely paranoid for the next couple weeks. Made for quite a good laugh in retrospect.

I figure most tech kids on the block where everybody goes to get a machine built or fixed would end up with pirated copies of Win2k or WinXP. So now those people try to update their machine have problems call the tech kid over who changes the key upgrades to SP2 and charges $20 for his time.