I had a nightly scheduled job that produced reports for all executives (including the CEO) in the company every morning. One morning, I discovered it had failed to run. After kicking off the long-running job, I performed a little investigation. It turned out that the power failed during the night, which normally wouldn't have been a problem, except the night security guard was disturbed by the beeping of the UPSes -- to shut them up, he shut them off.