For me it was something that happened recently. I was playing with a friend and for some reason one drum troll from mordor bugged in his running animation when he is on fire, so you couldnd kill him and he just kept running like forever in intervals, running over our troops. He would run for a moment then stop, but he kept running in the spot. We laughed our asses off when we saw him running towards our troops, with that funny animation, killing them and we running from him. The second time it happened he began attacking our troops while we were running from him, then suddenly he began running in the oposite direction towards my friends base. He destroyed one of my resource builings in the process and when he arrived at my friends base he began destroying it. We managed to kill it by defeating mordor, if not he would have destroyed his base. It was really funny to see that scene, with that never ending silly running animation, we couldnt stop laughing.