I have another one. Yesterday, Elyzona was trying to exit the Thalmor Embassy, and when you enter that little cave area, there's a Frost Troll. I kid you not, I died at least 15 times trying to get past the damn thing. I know Frost Trolls are meant to be hard, but holy crap... that was frustrating. Especially because Lydia suddenly reappeared in that cave after being gone for the whole quest, and there was 3 times where I killed the Troll, but Lydia died (as mentioned in other threads... I don't go on without Lydia). It was satisfying to see that stupid thing laying down face first when all was said and done.