When was the last time you lost a lot of work because of something that went unexpectantly wrong?

I was workin' on a bit of my story the other day. Now, I'm not normally "like WOW" with any of the work that I do, but the stuff I was writing was brilliant stuff. It had everything I wanted: tension, action, energy... and then, of course, something had to go wrong.

Something happened with the computer I was using and I ended up losing the whole post. I was mad, safe to say, and it still sucks two days later. I probably won't end up workin' on it for another week now.