Here's a fun one for you. I have been working on a novel for quite some time and was about halfway-ish done at 45k words. Nothing to it, really. Just takes time to write it, and I spent literally months online researching all the time as well since it takes place in norse mythology.
Then I had a brilliant idea. As I already had Windows and Freespire Linux installed as Dual Boot, I thought about getting rid of one. Freespire didn't recognize my modem, and Windows is... well, windows.

One thing lead to another, and before I knew it I was sitting with a Ubuntu Linux Live-CD. This lets me "fake" an Ubuntu installation by running it straight from the CD and try it before I actually install anything, just to see if it works. Funnily, it did recognize the modem, so I thought about installing it. As I depend on this computer and don't get to home until Christmas, I decided not to and restarted the computer. If something was to go wrong, it would help a lot to have another computer ready. There were some issues about lacking a user name and password, after all.
So the computer restarted, loaded the boot manager so I could choose my OS, and... Windows was gone? What the...? I tried Redetecting, but came up empty. I stared Freespire and searched for the windows part of the hard drive, but it was nowhere in sight. And with that gone, so was all my work.
In the end, I had to repartition the hard drive, reformat it and install Ubuntu from scratch just so I could go online again, which I depend on for various reasons like checking my e-mail.
So there you have it. The novel was halfway-ish done, and I had several others I had started on. All of it is gone for no apparent reason. The worst part is I can't really get angry either. All I lost was time and the pilot episode for Terminator: Sarah Connor Chronicles (excellent stuff, btw), and I did get rid of Windows once and for all. Loosing all my work is bad, of course, but loosing windows more than makes up for it.
Just keep that in mind. Backup, backup, backup. Always keep a backup. I have most of my earlier works stored on the internet, but for some reason I never bothered keep a backup of my current ideas and work-in-progresses. I know I should have. Annoyingly, the modem even has a 50MB "hard drive" where I could have stored my work, so even lacking storage space isn't an excuse. Damn.
