With no warning my mom sims died of laughter. I am so mad.

Couldn't agree more. A Sim can get Beaten UP without limit, like as many times as you care to try, and they only get the same Dazed moodlet you'd get from taking a second dose of cold medicine. Can't die from having the tar beaten out of you repeatedly (without mods) but you can die of embarrassment? Laughter? Well then, how come you can't die of being grungy? I mean, it could cause a skin condition or an infection that could kill you, potentially, right? But you literally cannot die of embarrassment no matter how much you might wish to. Farting in math class, brings on that kind of wish, but death is no rescue in that case.