Ideas
Since the latest patch, Sims with high friendship levels have started autonomously choosing mean interactions in the middle of friendly conversations. They’ll insult each other’s fang size, and I’ve already seen four fistfights break out. These Sims don’t have the Mean or Evil traits, nor do they have any grudges or negative sentiments toward each other. They’ve always gotten along well, so when my vampire Sims suddenly started brawling, I thought it might be related to vampirism—but it turns out that’s not the case, since I’ve also seen fights between humans and spellcasters. So far, about 90% of these fights involve the same Sim, which makes me wonder if it’s because of that Sim’s traits, their current mood, or just their temperament (or maybe they’re simply hot-headed, haha).