I just lost my space age white Mars Plastic eraser. Now I’m stuck with the piece of crap eraser that came with my mechanical pencil.
What did you just lose?
[sub]I’m sure this thread must have been done already, but I couldn’t find it.[/sub]
Baby’s favorite binkie. The remote. My train of thought…
Our salt and pepper shakers.
I have no idea how we could have lost them.
My mind. 
My symphonic choir letterman’s jacket and my $5 Mr. Grip pencil.
14 pounds since my last physical!!! WooHoo!
And 6 pounds before that one!!! More WooHoo!
Only 5 more pounds to go, and I’ll be the lean, mean love machine I aspire to be.
Canada, I lost Canada and I am not pleased.
My sanity
I lost 7 lbs so far.
I also, alas, lost my copies of the higher ed appropriations bills that I have to analyse. I can get other copies, but I’d already marked these up in a way to make it easier. I remember taking them in to a coworker’s office to go over some reporting requirements… and then I never put them back in the right folder. Argh, sigh.
My sense of youthful idealism.
'course… that’s been missing since i was eight.
My boss. But they’ve found me another one. Darn! 
My virginity. Oh, wait, there it is!
The opportunity to make my 1666th post a meaningful one.
[sub]Yeah, like the other 1665 were real winners…[/sub]
my sense of balance, as a bee flew into my face as I was getting into my car earlier today. I lurched backward and smacked the back of my head into the top of the door. Hard.
I think you all can guess what I lost after that…
R-n-R, who is now rubbing the spot behind her ear and saying ‘ouchie’ a lot
A key. And soon, $50 to replace a lock.
My double-headed screwdriver.
My hairbrush.
You have no idea how much this upsets me.
I can’t find it, I live in a dorm room for crying out loud! It has to be here somewhere!
Crap.
My idealism… that’s been gone for a while
My belief in true love… wait nevermind, I found that
My sanity… wait, did I ever have that?
My keys… yeah those I just lost, did I lock the door… uh oh
Kitty
All sense of perspective.
Well I was expecting a litany of physical objects, but, hey, if you lost something esoteric, it’s not your fault.
I found my eraser. 
But I did lose that parking ticket…