Oh SHIT, you see someone you kind of, sort of know walking down the street! You REALLY don't want to talk to him because that would require thinking and being social and he seems like the type of guy who would talk about something STUPID like his DREAMS or some shit.
WHAT DO YOU DO?
1. Keep your head down and pretend not to see him.
2. Go ahead and wave him down, he's probably going to notice you anyways.
3. Turn and run in the other direction.