Actually I believe I did.
Somewhere in the mid 60's I bought a new Harrington & Richardson 999 .22 9 shot revolver. It broke open to eject brass and was easily reloaded. It was accurate, felt nice in the hand, and had a decent trigger. I really liked it. It was the first gun I ever purchased on my on rather than "borrowing it" from my father (who did not use them). After a few dozen rounds the cylinder started to pop off the gun when it was broken for a reload. This was not amusing.
It went back to the store after I cocked it, began raising it to the target (yes I know, bad technique), and it discharged. Finger not on or particularly near the trigger. I believe this was purely a mechanical malfunction.