That's not a problem with most of my friends. I know exactly where and when I met maggiedemay, stuckintraffik, and thaadd, for example. However, when and where I met edminster's dad, digex, and more recently chebutykin? They're like missing folders in the file cabinet of my mind. It bothers me sometimes. I can make guesses - I'm pretty sure I met Brian in junior high school, and Doug at one of the summer conventions in the Washington area; as for Melissa, I probably ran into her at Arcana a few years back - but in all their cases, as with others, I don't have that clear snapshot memory of meeting them for the first time. Weird.
Anyway, the meme from petsnakereggie's post is: leave one memory of you and me together. Doesn't have to be anything significant, though if it answers the question of where we met for the first time, that would be cool too.