- Wyatt Earp: [Opening Narration] In the opinion of mule owners, a mule is more intelligent than a horse. In the opinion of Shotgun Gibbs, his mule, Roscoe, was smarter than all other mules and most human beings. Thus, when a consignment of Army remounts was stolen from a livery stable in Tombstone, Roscoe happened to be the only eye witness. What could Roscoe do about it?