"The Iron Mule" is a 1925 slapstick comedy by the great silent comedian Roscoe "Fatty" Arbuckle, featuring Buster Keaton. The name also encapsulates the kind of movies we love to show; tough, burly, uncompromising shorts which can't be stopped. The Iron Mule was also an early name for the movie camera (perhaps an allusion to "The Iron Horse," a term for the locomotive).