Have you ever randomly run into someone you met in line?
I am a member of a local choir, and one week before rehearsal, I saw a new member. We stood there for quite a while, both knowing that we had seen each other before, but not knowing where. Finally, after about five minutes, we finally figured out that he was number 21 out of 20 in the Wii line on release day at WalMart. We both lol'd when we figured it out.