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Since it's a pull-hair-out-root day, fighting the machines which have taken over the planet, I thought I'd mention the time I had to troubleshoot a computer gone mad.

My co-worker thought her computer might have gotten a virus. Windows would open and shut mysteriously in response to a single-typed character. Print queues would fill with another keystroke. My first thought was "it's almost as if the control key is pressed when you type anything."

I don't think very linearly/logically without a lot of caffeine, so I spent another thirty minutes duly checking for viruses and wasting time on other hypotheses, before noticing that my first diagnosis was correct, the control key was depressed. The culprit: a cookie crumb had lodged in the control key! A clear case of the
Cookie.Monster8@MC virus.