About 5 years ago, I landed my first PC related job. Well, it wasnt very glamorous as all! I had to tear down computers and label *ALL* the parts and put them in a database. It was gruesome, but I got real familiar with all the systems componants and could disassemble machines like no other.
Anyways, one day I was working real fast (end of the month and trying to break a record). Well, one of the things we would do is test the machine and all its parts to see what was good and was a failed componant. Well, I ran the test, printed out the stats, and then began to dismember it. Once I popped the case the Videocard was the first thing to come out and after uncrewing it I yanked and *POOF* the thing sparked, popped, and burnt. Turns out I forgot to unplug the thing, lol!
Ah well....it was a mistake I've never repeated.