Zachariah (1971)
Zachariah (1971) is a film starring John Rubinstein as Zachariah and Don Johnson as his best friend Matthew. The film is loosely based on Hermann Hesse's novel Siddhartha, surrealistically adapted as a musical Western by Joe Massot and the members of the Firesign Theatre comedy troupe. The band Country Joe and the Fish perform as an inept gang of robbers (more adept as musicians) called "the Crackers," who are always "looking for people who like to draw." In the same vein, Zachariah boasts: "I can think, I can wait, and I'm fast on the draw." This is a parody of Siddhartha's famous line: "I can think, I can wait, I can fast."
More at Wikipedia.