When the original game came out, I always took good care of my sims. Until...in real life someone badly mistreated my spouse.
Made a sim of EvilPerson. Made his life a living hell!* To my surprise, it helped relieve me of my powerless rage. Then the first-ever Pets came out, and I gave EvilPerson a kitten (they never grew up then, iirc--so this was still TS1, I guess). Adorable little kitten would race out the door to greet EvilPerson every day when he returned from work. I couldn't hate him anymore!
However, since then, I confess I have amused myself by creating a sim or two to torment. Their antics tend to be a lot funnier than the ones who are well-cared for.
*You know--wouldn't let him pee or bathe, made him sleep on the floor, no fun activities, no socializing. Nuttin'! All work and no play, oh yeah that's what he got. :naughty: