Wreck Cog Nation

Walking down a street or passing people by what do you do?  Try to be invisible to everyone. Walk a little faster.  Put on a non expressive face.  Or Say a friendly hello.  Make a little smile and back it up with a nod.  Which one makes you feel?  Which one makes you not?  What makes someone recognize another person?  What makes your neurons fire or not fire? ...........Hello! or Hell.....O!