Does this one count?
I was sighting in a scope on my 30-06 at an indoor shooting range - no one else was around. When I was done and my target was right in front of me, I very casually remembered "oh yeah, press the trigger just to make sure.....BAM!" I was just going through the motions and didn't expect to actually have a round chambered. I was holding the rifle down by my waist when I pressed the trigger - fortunately it was pointed downrange. The muzzle blast blew a huge hole in the cardboard target support (really demonstrated the ferocity of 30-06 muzzle blast). I had a good grip on the gun, so no harm, other than I was startled.
I was sighting in a scope on my 30-06 at an indoor shooting range - no one else was around. When I was done and my target was right in front of me, I very casually remembered "oh yeah, press the trigger just to make sure.....BAM!" I was just going through the motions and didn't expect to actually have a round chambered. I was holding the rifle down by my waist when I pressed the trigger - fortunately it was pointed downrange. The muzzle blast blew a huge hole in the cardboard target support (really demonstrated the ferocity of 30-06 muzzle blast). I had a good grip on the gun, so no harm, other than I was startled.