I had remarkably few bad epxeriences on CoH... and of those I had none were bad enough to remember.
But at my first MMo, World of Farmcraft, there was one occasion that had me ragequit the group. Well, sort of.
My Main was a Warlock and we were running this one T-roll city instance in the desert, forgot the name.
Anyway there I was dotting everything in range, siccing my dog on whatever was attacking the priest and handing out healstones like they were on discount.
The teamleader who was incidentally our tank (guess who had to keep the healer alive
) thought for some reason that I were a mage.
SHEEP!
SHEEP!
GIVE ME BREAD!!
SHEEEEEEEEEEP!!1!Yes, I tried to tell him that I couldn't do anything of what he was demanding; because, well I was no mage.
SHEEP!
BREAD!
SHEEP!!
Then he'd start again to chew me out that I were the worst mage he'd ever run with and if I could do anything.
3/4 through the instance I snapped and told him, "Wanna see what i can do?"
So I summoned my beloved Infernal, send him to attack the group of mobs that was the farest away from us. When the demon reached it, and was pulling a nice train of mobs, I released it, which makes the Infernal attack the warlock...and his group.
And then I left the instance.
Don't. Push. A. Warlock.
Boy was there some cursing in chat afterwards