I've had it happen. Pulling before me and tanking things, with the healer healing them. It was like I wasn't even there. So I just left. And this was tam tara and I was a new tank. Speed running is actually scary to me as a tank.

As a DPS, I guess I'm every tanks best friend. I never pull before them.. and the other DPS doesn't either. Ya know, I try to be nice and easy going in my groups..