I had something that fits in here just a short while ago. I downloaded the latest Dragon Age: Origins DLC today, Golems of Amarok. When I got to the final boss I found him to be stupidly overpowered. Or, not the final boss I should say, but instead his unlimited supply of minions. Since I was playing on Nightmare difficulty, I suppose this can be forgiven. Eventually I turned the difficulty down to hard. At this point, after I beat the final boss' first form, killed all his minions, and proceeded to start in on his second form, the bastard got stuck in a wall. I could not target him and he could not target me. At this point I raged, cried and quit. Fuck Golems of Amarok.