Every so often as a tank or healer, you get the uncontrollable urge to scream various profanities at your group and ragequit in the middle of a pull just to show the bastards who's boss. Unfortunately, there's not much content that's really forgiving to this approach, and it's kind of a jerk thing to do on its own. Most of the time, you either have to suffer in silence as the group blames you for everything that has ever gone wrong with their lives, or else drop group and eat the Dungeon Finder cooldown.
But that is no longer true. In patch 4.3, Blizzard has bestowed upon our little world a heroic boss known as Murozond, who upends the traditional responsibility to our groups and encourages us to care about nobody but ourselves.
The developers have given us the greatest gift that any tank or healer can get: