When you see someone, they say hi to you, you say hi to them, and you don't know who they are, even though you know who they are?
I was in wal mart today, and i saw a girl, she looked hot and familiar, so i walked past her and we both made eye contact and smiled and said hi, in a way that you've bumped into someone you knew and such. Damn it to hell if i knew her, but just couldn't place her. I will be willing to bet that she was my neighbor at RIT though. Now, this is hope mills, NC, so that's a stretch, but i'll wager $20 on it. God, i hate that feeling though!