Something has gone horribly horribly wrong, and now the dead have risen and are invading The Hollow with an insatiable hunger for the flesh of the living! Can the PCs figure out what caused the outbreak, and how to stop it? Hell, can they just manage to survive? On the other hand, is being a zombie really so bad? Now, the future of humanity rests in the hands of a man with a borderline psychotic personality disorder...
And a chainsaw.
You're kidding, right? Zombie movies. Duh. Okay, here goes: This scenario draws most heavily from the less serious zombie flicks out there, so start with Shaun of the Dead, Fido, Zombieland, Return of the Living Dead (and sequels), Undead, and the Evil Dead trilogy. From there, you can move on to the classic stuff like Night of the Living Dead (and sequels), 28 Days Later/28 Weeks Later, and Dawn of the Dead (the 2003 remake).