Have you ever wiped out your computer?

I just tried to install Boot Camp, made a miscalculation, wiped out my entire HD, luckily I had a Time Machine backup. So I wiped the hard drive of my new “Windows Machine” and reinstalled OSX 10.5. Then I restored from Time Machine, and then I downloaded the 10.2.5 update. Needless to say I was somewhat worried during this process. Had it not been for my external I would be completely screwed right now.

So, tell me about your close calls and near misses, I have more which I might add later.