Yellow Submarine is a Beatles song written by Ringo Starr.
The song, or at least the title, was the basis for dark and tedious 1968 animated film. The visual style is Peter Max meets Dr. Suess (but is mugged by Monty Python). The first 8 minutes (before the credits) are way too long and unpleasant; the film is not as good as a music video, and much longer.