I can't think of this one website and it's on the tip of my tongue.

[Alkesh]

It's this site that tries to help you locate people you see or run into but never got the chance to meet. For example one guy posted something along the lines of "i saw you at the Vons in glendale wearing a blue jacket." One guy even posted "you held briefcase #15 on Deal or No Deal last night... call me ###-###-####."

Any ideas?

 

[giantpinkbunnyhead]

Craiglist has a section that handles those things, called "missed connections". Find the craiglist for your city (i.e. anchorage.craiglist.com in my case) and look for missed connections on the main page. That's the only one I know of.