Who doesn't love zombies?

I think it could be an awesome sort of quest. For a smallish group, say 25-50 total participants at a time.

The goal is obviously to survive using your wits and your skills, with emphasis on the former.

You could use various mechanics that already exist to spread the horrible zombie disease amongst participants, once the "zombie shoe drops". Things like the red rot contagion script to spread the zombie infection amongst players.

Then, once a participant is infected, their speech is garbled ala drunkness mechanics/scripting.

I'm sure there's more that could be used and done... this is just off the top of my head.