I've never destroyed my own computer hardware, but my mother has thrown my computer down the stairs once when she got angry at me sleeping in during the summer.
I recovered it, and surprisingly the mobo came out fine. The only problem with it was one of the latches that hooked onto the processor was broken, but that was easily fixed. Then, of course, I accidently snap off a crystal when I'm installing the mobo into a new case
The hard drive was dead, nothing could revive it. The CD rom drive worked, but the tray never came out straight anymore.
I ended up getting a whole new computer, it was time for an upgrade anyway, and this gave me an excuse.