Re: Is it me or all my sims have been dying of laughter?
Yeah, it happens a lot. I had to use MCCC to disable emotional deaths, and finally started using a mod that overhauls moods.
The issue is that lots of things give happy buffs. Some things (phone calls, warm laundry, bubble baths, comedy on TV) give playful buffs. Happy boosts playful, so I've had Sims get hysterical because they had +13 happy and then their daughter with whom they had good sentiments came in and they got a single +1 playful moodlet from the sentiment. HAHAHAHA I LOVE YOU TO DEATH.... literally.
TL;DR: Hysterical has become far too easy. My cheerful Sim died at least 4 times of hysteria and every time we gave Grim a death flower.
I recommend things that change the emotion, such as starting a club with a different emotional tone, or eating a Jungle Adventure mood berry, or something like that if they seem to be getting hysterical.