No matter where you are in your life, whatever set of people you're with, it all still breaks down like high school does. You have your social cliques, you have the people you get along with, the people you don't and the people you're ambivalent about. All of the dynamics are still here.
I'm fascinated with worlds where there's a small population left, whether it's a movie or these TV shows that fascinate me - 'Falling Skies' or 'The Walking Dead' - they are about survival and triumphing over difficult times. I just have a thing for 'em.