And Then John Was a Zombie/Playing With

Basic Trope: A character is fighting monsters but eventually becomes one.
 * Straight: John, one of the lead survivors of the Zombie Apocalypse, is turned into a zombie.
 * Exaggerated: John, the last survivor of the Zombie Apocalypse, is turned into a zombie at the end of the movie.
 * Downplayed: John stands up to the school bullies but ends up joining their gang in the third act.
 * Justified:
 * John surrendered himself to the zombies after having reached his Despair Event Horizon.
 * John sacrificed himself so that the other survivors could escape.
 * Inverted: One of the zombies is injected with the cure to The Virus. Humanity Ensues.
 * Subverted: John is bitten by a zombie, but does not become one, either because he is immune or because he took the cure to The Virus beforehand.
 * Double Subverted: ...However, a horde of zombies attack John, who is subsequently bitten by so many of them that the anti-virus is no longer effective.
 * Parodied: ???
 * Zig Zagged: John was bitten by a Vampire, And Then John Was a Zombie.
 * Averted: John either survives the Zombie Apocalypse or is killed, but either way he does not become a zombie.
 * Enforced: "Everybody Lives...that's too boring. How can we add some dramatic tension? WAIT! I'VE GOT IT!!"
 * Lampshaded: "One day he was fighting by our side...the next...he was bitten, And Then John Was a Zombie!"
 * Invoked: The Big Bad releases The Virus specifically to make John a zombie.
 * Exploited: John allows himself to get bitten by a zombie, hoping he has the willpower to fight off the horde with his newfound abilities.
 * Defied: John is injected with the cure to The Virus just before it's too late.
 * Discussed: "No, John didn't die. He turned into a zombie."
 * Conversed: "...and then John was a zombie. Wow, way to add some emotional value!"

...and then you went back to And Then John Was a Zombie.