Oh, when they're about to wet their pants or pass out and I tell them to go pee or go to bed, and they take the time to flail their arms and whine - I went ahead and killed a family of Sims that was doing that once. If they'd STFU and quit whining, they'd get their needs taken care of! And the little titty baby fits they throw when they can't get to something. When the terrain is wonky and they have trouble reaching things the urge to kill rises!
And then the stupid dance on the parents' feet that the kids do. It was cute the first 50 times, but now I can't stand their little whiney screaming voices while they're doing that. I need to find a hack that deals with that!
Or when they're a little bit hungry and they go and serve a whole meal of lobster!
Also in Sims 1, Betty frickin' Newbie ALWAYS clogged up the damn toilets when she visited someone else! Whenever she came over I could just expect to have one of my Sims unclog her crap from the stupid thing!