Sentiments that make absolutely no sense.
A couple of examples from my game recently: Married couple, maxed out romance level, sharing a meal and conversation with their daughter when one of them becomes enraged and gets a long term bitter...
Forum Discussion
One of my sims recently developed a bitter sentiment towards someone else in the household for no apparent reason, and got a tense moodlet every time they were in the same room. It has since disappeared, but I have no idea what caused it in the first place. If the game at least told you why some of those sentiments come up...
