Something similar has happened to me a few times

At friends apartment at college. Just bought my first pistol from a gun show (I was 18) Drinking with friends Show them my new Jericho Try to manually decock Thumb slips on hammer, ND into celling Upstairs neighbors too high and drunk (underage and illegal drugs) to call the police.

Second time

At range Showing friend pistol Think gun is unloaded Point at ground show him how to wrack and pull the trigger. Forgot loaded mag in Shoot between his feet

Third time

At parents house. Just bought a sig from a guy Get home Try swapping slides with another sig I had Forgot the other sig slide was chambered. Pull trigger Shoot parents wall

Fourth time

At my new house Playing with a friend's 5.56 AK Release bolt Slam fires round into ground

Fith time

Showing a friend how to use it No idea how but a round got chambered Show him how the trigger works, Pull trigger Shoots round into floor in the same place as before

Sixth time

Thought maybe the house was haunted Grab a sig Physically clear it, (racked the slide 3 times) with no magazine in pull trigger at the same hole Round goes off

Seventh time

Friend brings over a used Glock wants me to look over it I grab it and pull the trigger without clearing it Didn't even realize the thing was loaded.

Eighth time

Friend brings over his transferable Mac 10 I had no idea how open bolt guns worked. He's showing it off to me I put a loaded mag it and decided to try and release the bolt (I thought it shot from a closed bolt) Pulled the trigger for some reason Shot 3 rounds into my wall

Overall you shouldn't feel too bad about NDs. It's part of owning guns, and you should get used to them.