I have never had it happen to me, and it is very rare, but wartime P.38's have been known to break the safety and fire when decocked using the safety. When that happens, they go full auto and empty the magazine. I heard that that happened to an agent in an office of one of our better known federal LE agencies. He was, for some reason, carrying a P.38, and when he loaded it and dropped the hammer, a series of loud noises ensued, followed by a deep silence. Luckily, no one was injured.
Jim