The Trip (1967) is a cult film released by American International Pictures, directed by Roger Corman, written by Jack Nicholson, and shot on location in and around Los Angeles, including on top of Kirkwood in Laurel Canyon, Hollywood Hills, and near Big Sur, California in 1967. Peter Fonda stars as a young television commercial director, Paul Groves.

The Trip also features Dennis Hopper as Groves' dealer Max, who appears here with Fonda in a precursor role to Easy Rider (1969). Contrary to their characters in Easy Rider, though—and for obvious reasons—Fonda's Paul Groves acts paranoid and anxious in The Trip, while Hopper's Max appears calm and collected.
Corman wildly edited some scenes for The Trip, particularly the exterior night scenes on the Sunset Strip, to simulate the LSD user's racing mind. The Trip features photographic effects, body paint on seminude actresses to lend atmosphere, and colorful patterned lighting, during sex scenes and in a club, which imitates LSD-induced hallucinations. Finally, Corman included inscrutable fantasy sequences including one where Fonda is faced with revolving pictures of Che Guevara, Sophia Loren and Khalil Gibran in a wildly lit room. For no apparent reason, a midget riding a merry-go-round in the background blurts "Bay of Pigs!!" The story plays over a musical backdrop of improvisational jazz, blues rock of the band The Electric Flag, plus an exotic musical score with an organ and horn-drenched theme.
Roger Corman did research by taking LSD himself. Charles B. Griffith wrote the first two drafts of the script—the first one was about the social issues of the sixties, the second one was an opera. Corman then hired Jack Nicholson to write the eventual screenplay. Corman encouraged Nicholson's experimental writing style and gives between 80 and 90 percent credit to Nicholson for the shooting script in the director's commentary appearing on the DVD of this film. Corman slightly modified the story to stay within budget.