Two wow moments already this morning.
I was collecting Marks of Dibella from Haelga's various male consorts in Riften, after being asked to by her niece, Svana. I went into the Bee and Barb to find Bolli, who was sitting at a table with a mug of mead. I asked him for the Mark of Dibella, and he denied ever cheating on his wife. So I threatened him, and then he caved, saying that he didn't mean to do it and that Haelga must have slipped something into his drink. At this point, I look over to my left, and who should be sitting across the table from Bolli but Haelga! So, he's trying to convince me that he didn't mean to have an affair with a woman who he's currently sharing a drink at the pub with. Yeeeeeah...
A little later, I went back to Haelga's Bunkhouse to tell Svana that I'd collected all of the Marks of Dibella. The place was just as busy as the Bee and Barb, being late in the evening now. Grelka was there, and, despite not talking to her at all, she spewed her regular BS at me - "Can't you bother me at the stall like everyone else?" and "Come back when you're ready to spend more gold!" I decided right then and there that I wasn't going to take her crap anymore - she was going to die. I waited until everyone went upstairs, and then followed Grelka up to her bed. Since I'm playing a pure mage and couldn't one-shot her with a dagger, I conjured a flame atronach, hit Grelka with a firebolt, and ran for it before anyone knew it came from me - hoping that my atronach would take care of the rest. Unfortunately, it didn't, I assume since Grelka wasn't hostile towards me. In fact, Grelka thought Wujeeta had cast the firebolt, and attacked her! She killed Wujeeta pretty quickly, and then moved on to Svana, who had joined the fight, and killed her, too. Grelka was finally taken down by the double-team of Tythis Ulen and Haelga. The entire time, I just stood there and watched, enthralled. I've never seen NPCs battle each other like that. It was awesome.