It's the zombie apocalypse. You were immune but didn't know it yet. Your in a store getting supplies when a sound catches your attention. Lucky you it's a zombie! You go run out of the store and make it into a building. Your going up the stairs when you hear noise coming from a room. You decide to investigate. You bend down and under the door you see three pairs of feet. You back up slightly surprised and debate on what to do

Suddently you hear the door nob creak