I once seen a 1 strand electric fence make a 1200 pound appaloosa do a backwards flip. It had been unpluged for a couple of weeks and he was starting to crowd it. I pluged it in and come back out to test it. Didn't have to, he tested it for me. He stuck his nose up to it like he was smelling it, and got to within about a half inch when I saw the blue spark jump to his nose. Never new a horse could move like that.
