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Being a Board Gamer player, I really want to see the "Traitor Mechanic" implemented in an MMORPG or a Multi Player game.
What do I mean by the Traitor Mechanic?
In some cooperative board games where players work together to beat the game there's a mechanic which "might" make one of your team mates a traitor which his/her own goal is to sabotage your progress (for a reward). You will never know if there's one though and you cannot tell for sure who's a traitor.
The whole gaming mechanic should make this implementation logical (it doesn't make sense if we're talking about the standard dungeon crawling experience). It can fit any kind of cooperative theme/game play.
This mechanics gives my playing group a new kind of game play experience where you're really could end up accusing almost everyone of being a traitor and you can do something about it but you're never sure. Should we put him in jail? should we execute her? Are you a traitor? Is there a traitor?