Twentieth Century Fox
The book: "A masterpiece. A cry from hell, a brutal, terrifying, and savagely funny book that swings between uncontrolled hallucination and fierce, exact satire." -- Newsweek
Why it's unfilmable: Where to start ... it's a non-linear narrative, meaning you can read it in any order. It was banned for being obscene. It involves murder, drug abuse, hallucinatory creatures, sex toys, sex acts and a whole lot more. The book doesn't so much end as just ... stop.
The movie: "Obviously this is not everybody's cup of weird tea: You must have a taste for the esthetics of disgust. For those up to the dare, it's one clammily compelling movie." -- David Ansen, Newsweek.
"For the most part this is a coolly riveting film and even a darkly entertaining one, at least for audiences with steel nerves, a predisposition toward Mr. Burroughs and a willingness to meet Mr. [David] Cronenberg halfway." -- Janet Maslin, New York Times.