Bad things always happen when you really don't need it.
The SVN checkout of the project I'm currently working on is stored on an encrypted disk image for security reasons. We're just a few days away from the code freeze of the very first internal release, and today after lunch, my Mac did not wanted to exit sleep mode.
I had to hard-reboot it, and mounting the image gave me a frightening "Corrupted disk image". Aaaaaaargh! Quick, start Disk Utility. Doesn't even see the volume in the disk image :-(
I'm now waiting for a big fresh new checkout to go down the network to a freshly created image... Fortunately I had no pending commits, and not that much local files on the old image.