With all the cheats there are, it's fun to do things that are out of the ordinary. I remember my friend used to lock up Sims inside a room by deleting the door and let them die just to see if they'd turn into ghosts.
I've done things like keeping them swimming in the pool or tried to hook up two guys together, but other than that, I guess I don't have much imagination. What funny things have you done with your Sims and in which version? It'd be funny if we could learn stuff here and try out a few things. haha!
Flying at night...