It's the Zombie apocalypse.

You are in a forest on a high up branch of a tree. you have a bag with water and food, but only to last a couple of days. Soon you'll have to go to a store for a supply run.

You heard a twig break, you looked around to see a figure in the shadows. You squinted your eyes to get a better look at what it was, It was a zombie. But zombies don't act like that, zombies usually were dumb brainless hungry idiots. this one was staring at you; stalking you.