I always try to be aware of noises that sound like guns being shot, and I notice suspicious people. I was in Church once and this guy was acting kind of weird, and he got up and walked down the aisle at an odd time, so I made sure I watched him. I thought he may have been going to the back of the Church to start shooting. I'm not sure what he was up to, but since there were other guys standing in the back he didn't do anything. These crimes do make you aware of your surroundings. He may have thought those other guys had guns and maybe they did. Thanks for the book recommendation.