This was actually a while back, but it's good to keep an extra copy or two of anything. I tried to print my paper off, but the bloody thing didn't print at all. It just sat there, chilling, and constantly spamming error messages. So then I make changes to my paper, save it, and... my file disappears. I gacked, but remembered that I kept another one elsewhere and rushed back to retrieve. Would have been bad if I didn't turn that paper in on time.