Years ago I went out west to visit a friend. His family had a bunch of milsurps and we made plans to go out to his local range. At some point a Walther P1 was produced. For whatever reason, I loaded the gun and decocked it before lining up the sights. Scattered all over the range as targets were a bunch of golf balls so I lined up on one about 7 yards away and hauled back on the trigger (the double action pull being tremendous on the P1). To my surprise the golf ball shot up in the air about 3-4 feet, then suddenly rocketed away from the firing line. With the trigger pull requiring as much force as it did, I had flubbed the shot and actually squeezed off 2 shots. The second shot had miraculously connected with the golf ball as it floated in front of me (which we confirmed when we retrieved the ball). Everyone was pretty impressed. I knew I couldn't make a shot like that again if I wanted to.
Fast forward a few years and I was at an indoor range with MY P1. Again there were golf balls on the ground. We were happily blasting away at the balls, trying to drive them to the backstop when I loaded a fresh magazine and decocked my P1. My first shot hit the golf ball, the second (accidental) shot again got away from me. Wouldn't you know, it hit the airborne golf ball again!
I have shot quite a few golf balls over the years. They make challenging targets, particularly at longer ranges. Only on those 2 occasions have I had them change direction mid-flight. I should also add, I own a variety of DA/SA guns and I can't recall any other time the SA shot got away from me like it did on both of those days. Just one (or two in this case) of those things!