I never do anything that can be considered bad or wrong, with maybe one exception.

If I'm a tank, I let die every DPS/healer who pulls before me because they're trying to force a speedrun. "Not in my run, boy" Well, I don't do it always, only sometines when I'm sick of idiots speedrunnig every sinlge fucking thing in the game and complaining because "it is too slow". I usually end with a "You like tanking? :3"