Psych-Out

Psych-Out is a 1968 American psychedelic film about hippies, psychedelic music and recreational drugs starring Susan Strasberg, Jack Nicholson, Bruce Dern, Adam Roarke, and Max Julien. It was produced and released by American International Pictures. The film was directed by Richard Rush, and the cinematographer was László Kovács. The bands Strawberry Alarm Clock and The Seeds can be seen playing within the music and dance scenes throughout the film.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.