While I was in college, I awoke to the crashing sound of some ice trays falling to the floor in my downstairs kitchen. I instantly realized I had left them on a table in front of a window. I retrieved my Mossberg 500 (a pump-action shotgun) and stood at the top of my stairs listening. I heard breathing and racked the slide, making that distinctive noise any fool would recognize. The intruder left through the front door in quite a rush, and had some difficulty unlocking the bolt and chain. About a month later a female resident was slashed and killed in her apartment, the assailant was captured and was known to have a long history of mental instability. While this perp was at large the local police recommended that the residents of the building arm themselves and even conducted training.