Does anyone use cowplants in mean ways? Evil sims, black widow, ect.

Interesting topic. I haven't played a character like that, but I've placed two cowplants at Von Haunt Estate to add a sense of danger. I think the key is to have several cowplants (perhaps in a well decorated environment, so the eaten by cowplant buff gets overriden?).

If sims are enemies they can get happy when their enemy dies? I don't remember for sure, but at least they get an option to laugh at their tombstone.