I have heard of several people sitting in the tree all morning and coming out at lunchtime to discover that their gun was unloaded all morning long. This past season I started my 14 year old nephew to hunting. I placed him in a tree about 60 yards away out of my view. He has lots of dove and squirrel experience. On Thanksgiving morning I had alredy heard a plastic water bottle make a popping noice from his direction. At about 10:30 I heard a snap-click-clack-click noise and a second later he shot. I saw a deer running down the pine ridge at me and started to shoot until I saw a lot of blood running down the deer's side. I watched for a few seconds and saw it fall. This was his first one ever. I found out in a little while that the click-clacking noise I heard was him bolting a cartridge into his .270 Remington 700 after it had snapped on an empty chamber. He had 3 in the magazine but forgot to put one in the chamber before daylight. It was funny to me and yes he was lucky the deer was walking and did not hear the noise.