so some co-workers/friends from a past job started a (2 piece) band and invited me to their first gig. one of them had been to my house and met my girlfriend a week before, the other didn't know her.
as we walk into the bar, the one who doesn't know my girlfriend, and his girlfriend were walking by, i said "hi!", and waved. i was right in front of them, they saw me, but did the "i don't know you so i'm gonna pretend like you were waving to someone else." then they walked right by. i was a little upset at first, then i thought "oh, wait, they didn't even recognize me, lol!"
so that was pretty cool... we ordered drinks and headed to where they were setting up in the music room. it took about 30 mins for the one who knew my girlfriend to figure out who i was.