Premise: The Habit of Happiness is a 1916 American silent comedy film directed by Allan Dwan and filmed by cinematographer Victor Fleming. The film was written by Allan Dwan and Shannon Fife from a suggestion by D. W. Griffith and stars Douglas Fairbanks. A 16mm print of the film is preserved in a private collection.
Hypothesis: Allan Dwan and Shannon Fife wrote The Habit of Happiness together.