Occultopedia suggests that urimancy was used by 16th and 17th century witchfinders, who apparently saw no irony in using occult practices to find witches. Iron objects were put in a bottle filled with the urine of the accused. If the corked popped out of the bottle, or the person became ill, they were guilty.
Another distasteful U is umbilicomancy, which is apparently divination by umbilical cord.