A couple of the Marriott elevator doors at Comic-Con welcomed us with this graphic from AMC's The Walking Dead. It was creepy-awesome. Picture 125,000 zombies lumbering through the streets of San Diego.  Overrunning the bayfront Convention Center, they choke all of the exit points that aren’t barricaded, clogging the sidewalks for about a quarter mile in every direction.  Now make the zombies normal people (well, sort of) and you’ve got San Diego Comic-Con.  Siphon off about