Gene Saks' 1968 movie stars Jack Lemmon as Felix Unger and Walter Matthau as Oscar Madison, who move in together after Felix and his wife separate but find their friendship tested by Felix's focus on cleanliness and Oscar's messy ways.
"Couple" started life as a play by Neil Simon (who also adapted the screenplay) on Broadway, where it also starred Matthau. After the success of the film, the story was adapted into a sitcom, which starred Jack Klugman as Oscar and Tony Randall as Felix and ran on ABC from 1970 to 1975.
The film's theme, composed by Neal Hefti, was used in the movie, the TV show, and the movie's sequel, 1998's 'The Odd Couple II.'
