In the Sims 3 I wanted to see how big the family tree could get so I knocked up half the town. There were a lot of angry couples stuck living with each other and most people were related in one or the other preventing any new romances

Killing a bunch of them in a pool and making a beautiful, beautiful cemetery!

Aside from trapping them in the pool, trapping them in the house, setting them on fire, making them live in a tiny box with no bathroom…?

Not much.

My first character is always a black widow. Marrying strangers, killing them off, all of it to fund the estate. And then the vampire child of the family gets the “graveyard” lot where all the husbands’ graves end up.

… It was especially fun in TS2 where I collected characters with special costumes like the Divas (new ones spawn).

Trying to kill children definitely qualifies, though it’s a boring answer.

But also: Married sims and kept them in the basement with an easel. Locked other sims in my lot, didn’t let them escape.

Had a 8 room Saw style sub-basement beneath a nice unassuming small 2 story house in the suburbs which housed random townies I would invite over and then trap for the purposes of torture, sexual deviancy and to sate the eventual blood lust brought on by the madness of the old ones.

So nothing major.