a 60 somethign year old dominoes driver got beat to death in a doorway (of a place that looked abandoned anyway) and was there for like two hours before the store even got worried enough about him to call the police and say "hey we are missing a driver and he went to such and such address." This happened in my town a few months ago Its all about situational awareness. if it looks sketchy lock your doors and call the motherfuckers.
