It's funny, Mike, most of the time so am I. The monkey mind in me is quiet, and if not quiet, I generally can ignore it and calm myself.
I've played hundreds of rugby matches. The absolutely best matches were played in an aroused, yet calm, state of mind, not enraged, though lord knows I've played enraged. An island of calm action on the sea of the rugby pitch...sounds goofy, but that's the way I played best.
As a high school wrestler, I would get freaked out and keyed up until I read something very similar to what Kevin posted, then I started to get more consistent and better.
Even as a competitive lifter, that's how I'd try to lift. Just the bar, and me, and no mental chatter, just focused on the lift.