I want that Dangerous stuff pack we had the survey on. In this pack our sims could hurt each other physically but it won't kill them. They would live with body aches for a duration of time. For instance your sim could be held responsible if you leave a puddle of pee on the ground and some other sim slips and fall. There could be cross pack compatibility of hiring a lawyer, getting arrested or being fine/repo'd to pay settlement. I want this to be the most dangerous world to live in, so some dangerous stuff could be caused by accident because of city neglect.
