How about " Don't leave. No really, why would you want to? I've counted, and these food crates will last exactly four years for one person, eating three portions a day. If you ration you could have two a day each, and still live for a while. You've got four beds, and even a working toilet! Shit, there's even a vending machine if you get thirsty! And boxes to restock it! Plus an invincible door, and only a few zombies know you're in here. First aid in case you accidentally cut yourself. Ammunition, guns... a coffee machine. Well, I'm off."