Probably the most heartbreaking moment I've experienced in The Sims 2 was that I had a married couple and they were maxed bars in relationship with two kids well I walked away for a minute to go eat lunch with my family and left the game running on full autonomy and I came back not even an hour later and the husband was sitting on the ground crying and the wife and kids were nowhere to be seen and their relationship bar had gone from 100% in love to 100% hatred. To this day I still have no idea what happened in that hour I was gone that this happened. I really liked that couple.