Horse is a 1965 underground film directed by Andy Warhol, written by Ronald Tavel, and starring Edie Sedgwick, Gregory Battcock, Tosh Carillo, Ondine, Norman Glick, Daniel Cassidy Jr., and Larry Latrae Latreille. Warhol himself makes a cameo appearance in the film.
The main event is a strip poker game in which an outlaw, his sheriff captor, and a pal join in. The game ends with the outlaw Tosh Carrillo getting beaten up by the others for cheating. At one point, one of the men sits on the real horse a stallion hired for the day by Warhol.
Source: Wikipedia