I actually experienced this malfunction at the firing range. Disengaging the manual safety (which lowers the hammer) actually caused the pistol to fire. Surprised the hell out of me the first time, fortunately I was smart enough to have the pistol pointed downrange when I did it. This is one of the reasons I got rid of the damn thing along with the fact that it constantly jammed when using ammunition other than Federal Eagle. I wonder if Smith & Wesson quality control problems extend into other areas as well such as their revolver lines. Makes me very hesitant to buy any of their products.