I had the nickname "Pathogen Boy" for awhile growing up, but I never killed a computer.
My older brother made his laptop a terminal ICU patient though. Found a REALLY nasty virus that worked so fast he actually got to watch his computer shit itself in real time.
Don't download pirated copies of Photoshop was the moral of the story there, by the way. His computer is still infected, but it's slowly getting better thanks to a highly experienced computer guy.
He almost killed the home comp by proxy, as he'd left a flash drive laying around that got plugged into a comp for a file transfer a couple months after his computer swallowed the bomb. Turns out it had been plugged into his comp at the time. Virus scanner caught it and fought it back (well, several virus scanners in concert), but the flashdrive was deemed 'horrifically plagued' and for shits and giggles, was left in a public bathroom on the ledge of a sink.
Don't remember what it was called but it was crazy bad virus.