I had a "stupid" discharge once. I was in a local IPSC club years ago, and the "hot" thing to do was modify magazines to hold 8 rounds. (1911 Colt) I came home from the range, dropped the magazine, stripped off 1, 2, 3, 4, 5, 6, 7, 8. That's a full load. Pointed the gun at the bookcase and dropped the hammer. BOOM! Forgot the one up the pipe. No damage except to the bookcase, the tops of several books and the frame around the sliding glass door.
Funny thing was that no one else in the house heard the shot including my wife's uncle who was visiting at the time. he was in the next room through an open door, and he said he thought I had "popped" a primer reloading. My Mother in Law, nor my wife heard it.
Scared the living SNOT out me. I shook for an hour or more. I still check guns three or four times to make sure they're clear.