I just read an article on the BBC website that I found reasonably funny. I thought that I was bad when it came to losing things, but Chile has lost an entire lake. Park rangers patrolled the area in March and it was perfectly fine, but come May, and the lake had completely vanished. All that was left was blocks of ice that had been floating on top.
One theory is that an earthquake opened up a fissure and the lake drained away. However, as drastic as this seems to the local wildlife, it must be noted that this lake wasn't even there thirty years ago, and that region's landscape is in constant change.