One of our mares came to us as a five year old, green broke and with tons of bad habits. She didn't like to turn right, and her 'trainers' solution was to bit her up to a curb, tie the horse's mouth to the saddle's D ring, and leverage it until the horse was literally bent in half. He then left the mare like that, by herself, for 3 hours and rode her hard afterwards. It was disgusting. It took me months and months to retrain her to even accept a bit in her mouth, much less look for it. She was also trained to dance and when she would get nervous about something she would begin to lift her front legs and 'dance', blow, and sweat. To this day she'll still do it if she gets worked up enough.