Paul Groves (Peter Fonda), a television commercial director, is in the midst of a personality crisis. His wife Sally (Susan Strasberg) has left him and he seeks the help of his friend John (Bruce Dern), a self-styled guru who’s an advocate of LSD. Paul asks John to be the guide on his first “trip”. John takes Paul to a “freak-out” at his friend Max’s (Dennis Hopper) pad. Splitting the scene, they score some acid from Max and return to John’s split-level pad with an indoor pool. Paul experiences visions of sex, death, strobe lights, flowers, dancing girls, witches, hooded riders, a torture chamber, and a dwarf. He panics but John tells him to “go with it, man.” Would you trust John? —IMDb
Roger William Corman (born April 5, 1926), sometimes nicknamed “King of the Bs” for his output of B-movies (though he himself rejects this as inaccurate), is an Academy Award-winning American producer and director of low-budget movies, some of which have an established critical reputation: his cycle of films derived from the tales of Edgar Allan Poe for example. Corman is also a sometime actor, taking minor roles in such films as The Silence of the Lambs, The Godfather Part II, Apollo 13 and Philadelphia.
Corman has apprenticed many now-famous directors, stressing the importance of budgeting and resourcefulness; Corman once joked he could make a film about the fall of the Roman Empire with two extras and a sagebrush. One of the most expensive films he produced was Battle Beyond the Stars. —Wikipedia
Well if you don't like psych what's the point of watching 60's picture about LSD trip directed by Corman? Soundtrack for "The Trip" by The Elctric Flag is by the way one of the best 60's albums.