Online Plague
Joi Ito talks about an inadvertent plague
spreading through World of Warcraft.
Evidently, there's some demon somewhere that infects you with some kind of disease while you're fighting it. Well, the disease spread to a nearby city or something (I'm not a gamer, so some of Ito's post is Greek to me), and now its wreaking havoc spreading from player to player throughout the game.
After reading Rory Blyth's write up of Star Wars Galaxies, and now this, it seems that online games generally suck, and are only fun if you just mess with them. Makes me want to play WoW or something, just to join in the anarchic merriment.