A 1920 silent film directed by Robert Wiene from a screenplay by Hans Janowitz and Carl Mayer. It is one of the most influential of German Expressionist films and is often considered one of the greatest horror movies of all time. This film is cited as having introduced the twist ending in cinema. It has also been postulated that the film — with its tyrannical central character of Caligari — can be considered as an allegory for German social attitudes in the post World War I period. Who knows! . . .