What's the most expensive thing you've ever lost?

[Sooga]

Today, through no one else's fault (or stupidity) other than my own, I lost my Nintendo DS. I don't want to get into the stupid details, but basically I just left the bag out in public accidentally. Not only that, but I had some games and a carrying case and all that, so when you add everything up, it was probably a ~$225 loss or so.

Yea, I know some of you wipe your ass with $225, but now that I think about it, that's probably the most expensive thing I've ever lost, which I guess means I've been pretty lucky.

I don't want this thread degenerating into stories about how your $50k car was stolen, or how your gambling-degenerate uncle stole $3k out of your dresser drawer. I'm asking about expensive things that you lost all on your own due to your stupidity or carelessness (or both).

I want to feel better about my loss today.