Back in my 20s I was out drinking with my best buddy Billy and we got in a fight over a girl. Billy ended up with the girl and I ended up getting supremely drunk and wrecking my car. The next day, Billy came by to discuss the matter of the girl, and the car, and we ended up shaking hands and drinking a bunch more and getting very wasted. I was still pissed at him, though, so I started challenging him at stuff. Arm wrestling (he won), beer chugging (I won), foot race (I think we both lost that one), and so on.
At one point I picked up a good size rock, drained my can of beer and bet him $20 he could toss it in the air and I could hit it with the rock. He jumped all over that, so I got set and he threw it as high as he could. As it was leaving his hand I could suddenly see the entire shot, and exactly where the rock and the beer can would meet in the air. Just before the can hit the highest part of its arc I let fly with my best shot and just blasted the thing right out of the sky, almost exactly like I had envisioned it in my mind. I hit it so well that it folded back over the rock and they fell to the ground together.
He just stared at me for several seconds while I hid my utter shock at what I had just done. Then I looked him square in the eye and asked, "Double or nothing?" He wanted no part of that action anymore and just paid me the twenty, and I never told him that, even sober, I probably would have missed 50 in a row after that. But that one shot I could see ahead of time as clear as can be, and I remember it to this day as an example of what the mind can direct the body to do, even if it's something you've never even tried before.
I have experienced this phenomenon numerous times in my life in many other areas, including at the table. It is always a fleeting thing for me, but maybe some are better than others at this sort of thing. I feel that if we could only have complete control of this part of our minds, we might all be champions. I also feel that this is part of the reason why some of us (myself included) can shoot a lot better after we've been drinking. Our inhibitions are gone and we really start to believe in ourselves and our abilities. We just "do it", and we find out that it actually works.