When the zombie apocalypse started many months ago, you were bitten by a zombie. To your surprise, the bite had no effect and faded into a nasty scar on your arm. One day, you were swarmed by zombies. After running for awhile, you came upon a man in a military uniform and gear who killed the zombies that were after you. He saw the faded bite mark and grabbed your arm to get a better look at the bite before asking in a tone of disbelief "You're.... Immune?"