Weird social drama annoys me! I was at a NYE gathering, really too small to be even called a party--there were 7 of us at the most, but 2 left early. They're more my boyfriend's friends than mine, but it was fun and I like everyone (some very much, others at least enough to socialize with.) We'd all settled in when randomly someone I hadn't met before showed up. Everyone seemed surprised-ish by this, and the dynamic seemed kind of off. One of the other guests left almost right away.
It turned out that only the host knew she was coming, but hadn't told anyone as a 'surprise', despite the fact that only himself was really close with her, and the others were sort of..friend-ish with her years back, but there had been drama and issues. The guest who left had major bad blood with her, and didn't even want to be in the room with her. The host knew about the bad blood, but still hadn't bothered to tell her she was coming. I was oblivious to the whole thing till afterwards. Now everyone is rather irritated at the situation and it just kind of cast a cloud over what was otherwise a really nice night.