For me the worst is probably talking. During my pre-shot routine my mind is not at all thinking about the shot. I constantly think of things around me. Usually when people are in my peripherals I have a fear I am going to hit them with the club even though they are not even close to me. The other day in a tournament I was teeing off and a lady was on another hole 25 yards away from me. There was no way I was going to hit her, but the whole time I was about to swing I kept thinking of hitting her accidentally. Sure enough, I worm burn it along the ground and the ball comes to rest right near her. Even as I was swinging she was a major distraction.