What's the most valuable thing you've lost?

I lost my GBA when I was younger, with my copy of Pokemon Sapphire that I had put some serious time into. That still stings me way more then any break up I've ever had. 

I took a keyboard to an 17" LCD monitor several years ago, that's probably it.

The love of my love, I can't really think of anything else.

Got a laptop stolen once.

" @ClaritySam said:

" My virginity :-) "

^ Everyone on this site should as cool as this guy. :p "

how can loosing love be corny?! its the sweetest thing in the world!
 
anyway! putting the love aside for this one then!
 
my pair of glasses that costed somewhere around 500€ kinda complicated... lost em at some bar but i thankfuly i knew the dj and he managed to find them and i got em back. lucky me!

Do people count? They're quite valuable technically. I lost my gran in a shop. Twice. 
In terms of material items, I have lost a few bits of jewellery which were quite valuable, and a diary when we moved house. It mysteriously didn't come off the removal van. Creepy perverted removal men wanting to read a 13 year old girls' diary...

My mind! Also my god damn blankie when I was 3! That sucked shit! 
 
I just realized that it would have made sense if my parents had just taken it to get rid of my dependency. Fuckin' parents, always ruining my fun.

A few pictures of an actresses breasts who got them out a few times for me at university when she was just another student and then went on to do Eastenders.  I sent the film off to a company that did 24 prints for 99p which I'd done all term long and they  sent back all the pics and negatives that weren't naked and a notice about unsuitable content.  I clearly could have sold them for not much, but a few quid.  Not that I would have, but I'd still have them for a bit of wahey!!!

Can't remember super well, but I was pissed at my brother when he forgot to grab Pokemon Sapphire out from the rental car before we returned it.

The rental car in California..... 
He screwed me over on that.

" Creepy perverted removal men wanting to read a 13 year old girls' diary... "

If it's worth a lot of money I don't lose it

Tony Hawk's Pro Skater 2. I lent it to my cousin a long time ago, and never got it back. Heartbreaking.

My self-satisfaction when drawing and painting.

" A few pictures of an actresses breasts who got them out a few times for me at university when she was just another student and then went on to do Eastenders.  I sent the film off to a company that did 24 prints for 99p which I'd done all term long and they  sent back all the pics and negatives that weren't naked and a notice about unsuitable content.  I clearly could have sold them for not much, but a few quid.  Not that I would have, but I'd still have them for a bit of wahey!!! "

A Blackberry. A painful, painful loss.  
 
R.I.P pouring one out for my fallen bruddas. 

I don't consider "stuff" all that valuable. I've never lost stuff I couldn't replace or do without. Sure, I've damaged some expensive things and had to buy new ones or just forget about it, but such is life. People, on the other hand, are irreplaceable. But I haven't had anyone close to me die, so I'm grateful for that. I sometimes miss people I'm no longer in touch with -- well, quite often, actually -- but I find comfort in knowing that there was a reason why I'm no longer in touch with them.
 
This thread has reminded me of that amazing Elizabeth Bishop poem, so I'm grateful for that as well.

My HTC Desire on a night out!

I rarely lose anything...so heres a complete list of all valuables that I've lost in my life (I'm 34, so its not too bad): 
1 mask, $60: Its somewhere at the bottom of a marina in Florida. 
1 magnetic building key, $20. Somewhere in the pacific ocean, around the east side of Oahu. 
1/8th, $60. In a Hardees in Florida. This was really my friends fault, since he was holding it at the time. 
1 reel, $35. At the bottom of the ocean in Turks and Caicos.

I guess when I buy expensive things, they are generally things that will stay in the house. I lost my first iPod for about a year and a half while moving...
 
And a copy of Super Mario Advance when I was about 13.

A short film about McCarthyism for  history class. Took me 6 months to make, hard drive blew up the day before the presentation.

Car keys with the backup key still attached to it...
 
... Effectively lost my car with that, until I cracked a window in.