I wrote in to SFX complaining about the poppets from Twilight being on the cover. Bloody pouty emo types!
That said, I'm surprised no one's thought of this before:
A Vampires Versus Zombies Movie!
Vampires chase Zombies because the fresher ones have blood, or maybe they like carrion too. The Zombies chase the Vampires because, undead or not, they still have braaaiinns.
Next year's Snakes On A Plane. You heard it hear first.