One of the most famous lines from "Withnail and I" is: "I’m not mad, I’m just a bit of a mess." This line captures the film's darkly comedic tone and the struggles of the characters, Withnail and Marwood, as they navigate their lives in 1960s London. The film is known for its sharp dialogue and memorable quotes, reflecting themes of friendship, desperation, and the absurdity of life.

In the movie "Withnail and I," the primary drug referenced is cannabis. The characters, Withnail and Marwood (I), frequently consume marijuana, which reflects their bohemian lifestyle and struggles with substance use. Additionally, there is a scene where Withnail mentions taking a "vitamin" that is actually a form of amphetamine, further highlighting their indulgence in drugs as a means of escape from their disillusioned lives. The film captures the 1960s counterculture and the impact of substance use on their friendship and experiences.

"Withnail and I," directed by Bruce Robinson, is a dark comedy that explores themes of friendship, disillusionment, and the struggles of artistic life in 1960s Britain. The film follows two out-of-work actors, Withnail and the nameless narrator, as they attempt to escape their grim reality through substance abuse and a disastrous trip to the country. The story highlights the absurdity of their lives, the impact of nostalgia, and the harshness of adulthood, ultimately portraying the difficulty of finding purpose in an unyielding world.

Yes, "Withnail and I" is loosely based on the experiences of its writer and director, Bruce Robinson. The film reflects his own life as a struggling actor in 1960s London, particularly his time spent with a friend in the countryside. While the characters and events are fictionalized, the film draws from Robinson's personal memories and experiences, capturing the essence of that era and the struggles of young artists.