Faulty user
Being cursed with the unofficial IT support role in one organisation, I had a colleague who used to go literally berserk with both her PC and printer. Her problem was deadlines. She'd leave printing large academic papers until, ooh, about 5 minutes to 5 and the postman would come and pick up at 5. So, several times a week there'd be a scream of "The fucking printer won't print!". This was quite often accompanied by impactful sound effects.
Muggins here would wander into her office and say "How many times did you press print?"
"Only fucking once!!!" would be shouted back. Of course, when you viewed the print spool, there'd be 20 jobs in the queue...
She once threw her mouse so hard at the monitor that we never did find its ball in the pig pen that was her office.