I had an "unloaded" shotgun go off in my bedroom when I was a kid. My dad taught me to unload and I made an effort to always remember to do that. I was going to clean it after a hunting trip and I had put it back in the case and transported it back home without unloading it. I dry fired it to take it apart and BOOM. Thank God it went through a back bedroom wall and tore some bark off of a tree in the back yard. Had I been facing 90 degrees to the left, the point of impact would have been right where my Dad was sitting in the next room. I've never forgotten that incident and I'm to this day, paranoid about an ND. When I take a gun from the safe, it gets checked EVERY time, no exception. If I've just checked it and put it back in the safe, it still gets checked again if I pull it out, no exception.