It is generally believed that Lee Marvin’s drunken horsemanship (as well as the comic appearance of his horse, which also appeared to be drunk) greatly assisted his winning the 1966 Academy Award for Best Actor. In case you are considering riding your own horse or mule while in a state similar to Marvin’s “Kid Shelleen,” this article may be of interest. While it is undoubtedly unethical to ride a horse while intoxicated (irresponsible, reckless, and dangerous to both the horse and anyone near it), it may not be illegal, because a horse is not a vehicle.