from Wikipedia:
The Unknown (1927) is a silent horror film directed by Tod Browning and featuring Lon Chaney as carnival knife thrower Alonzo the Armless and Joan Crawford as the scantily clad carnival girl he hopes to marry.
The Unknown is by far the most intense and demented of director Tod Browning's films (which include Dracula and Freaks). Joan Crawford always said that she learned more about acting from working with Chaney in this movie than from everything else in her long career put together, and critics often cite Chaney's performance as one of the greatest ever captured on film. Burt Lancaster always maintained that Chaney's portrayal in The Unknown was the most emotionally compelling film performance he had ever seen an actor give. Chaney also did remarkable and convincing collaborative scenes with real-life armless double Paul Desmuke (sometimes credited as Peter Dismuki), whose legs and feet were used to manipulate objects such as knives and cigarettes in frame with Chaney's upper body and face.
As with Freaks, contemporary reviewers were sometimes less appreciative. "A visit to the dissecting room in a hospital would be quite as pleasant," opined the New York Evening Post, "and at the same time more instructive." Modern viewers can discern the same macabre style of this film (and other Browning-Chaney collaborations) in later productions ranging from the 1930s Universal Studios horror films to the 1960s Twilight Zone and Alfred Hitchcock Presents programs.
For many years the film was available only in an incomplete 9.5 mm copy, until a much higher quality 35 mm print was found preserved in a French film archive in the early-1970s. Several scenes from the early part of the film are still missing, but these do not seriously affect the story continuity.