While working in desktop support at a major university, I received a frantic phone call one day from one of the administrative assistants.
First, the backstory: Phone calls from this particular user, "Mary," were always interesting. She was at least 70 years old, had worked there probably since the dawn of time, wore high heels and blue jeans, and smoked like a chimney. She lived way out in the country and told me one day that part of why she worked was so that she wasn't home all day with her husband because one of them would kill the other with a shotgun. I thought, "OK ..."
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On the technology side, Mary's computing platform of choice was an ancient Sun Workstation with a monochrome monitor. She typed up all the exams for her professors on this Sun using LaTeX, and only grudgingly was starting to use the Windows machine that we were trying to get her moved to. She was very good with vi and the command line, but didn't know how to use Word and was confused by a GUI. The problems she'd call about were either somewhat complex Unix questions or insanely simple Windows problems.
On this particular day, Mary called with a Windows question and explained that when she printed, her computer shut off. I figured the problem might be driver related and tried to talk her through describing what was happening. I didn't really get anywhere over the phone, so I headed down to her office.
When I entered her office, I noticed it was unusually cold. She had the thermostat turned down to 59 degrees.
While shivering, I asked her to demonstrate the print job for me. Lo and behold, as soon as she tried to print, the laser printer fired up and the PC shut off, then rebooted.