LOUISVILLE, Ky. – There’s really nothing normal about this, not at all. Stuff 20 3-year-old horses into a metal contraption. Surround them with about 150,000 cheering fans, many lunatics fortified for the previous eight hours with alcoholic beverages. Have them run 1 1/4 miles with tiny, brave humans on their backs. Make them turn left a couple of times. See which one emerges first. Then throw roses on that horse’s back.