The other new one to me: gangs of kids inhaling freon from building ACs. The orthodontist told me his office AC went out one day -- all of the freon was gone, and a neighbor reported seeing kids on the roof. This happened several times and the police finally advised him to put a lock box on the controls. Apparently this is a big problem in the area, and businesses with ACs on the ground floor now install lock boxes as a matter of course.