I'm here for The Sims 2. I always go into phases where I'm obsessed with it. I have a family that I really like, but I stay using cheats with them all the time. I freeze their motives so they can work out & study and sent the daughter to university the DAY I was allowed to. I always have the husband flirt and sleep with the nannies.

Also, I move random people walking down the sidewalk into 'cages' on the roof where they stink, piss, and eventually die.
My favorite thing to do is break something, have a repairman come, take away his repair skill points, and let him get electrocuted to death.

Although sometimes they just get black and burnt and walk around my house for ages.