"its such a wonderful day. i wounder how it looks outside?" zombies roam free scratching at a 10 foot wall of cement and banging on an iron gate. a sniper on the roof with a few of his buddys are having a few beers and poping a few headshots off. people lift a manhole and more people arrive with supplys and new people.
The world is taking over by zombies. start anywhere, there is a safezone. a prison outside of a city. you can start in the city in a house on a rooftop, in the prison, etc.