Horses kill themselves doing this. I know countless horses who have broken neaks or legs(more than one) and had to be put down. Why were people screaming and waving at he horse to urge it faster. There were even people sitting in the middle when the lady said take then to the on side, they did not, and look what happened, 2 or 3 times they ran into and pushed and stepped and jumped over other horses. None she think that is funny.