A new ad that popped up on Rockstar Social Club got the folks at Joystiq speculating that the Xbox 360 DLC for Grand Theft Auto IV might involve a potential zombie outbreak.

That would be freaky sweet.

The ad on the website shows a Quarantine order from Eugenics Inc., locking down its compound due to a disease outbreak. Eugenics Inc., which can be found in Liberty City, hasn't played any part in the game yet, but the ad suggests that that's going to change soon.

Now it should be said that this isn't the first Eugenics ad to appear on the Rockstar Social Club. The first one was a "Sperm for Cash" ad back in April, and that didn't become an in-game event (fortunately?). However, this Quarantine ad certainly seems more likely as a hint for the upcoming DLC.

Joystiq pointed out that GTA IV already has art assets in place for zombies, namely an unlockable zombie. An unlockable half-naked zombie that groans. Given that, a zombie outbreak doesn't sound so far fetched. It's only a theory, and it probably won't happen, but it'd be awesome if it did.

Here's half-naked groaning zombie for your enjoyment:

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