A Clockwork Orange (1971)
The fact that the book Clockwork Orange was not as good as the movie is a bit strange considering the fact that Stanley Kubrick, the writer of the book, also directed the film.
Source: YouTube
Well, he did not necessarily write the book, he more or less re-adapted the British version of the book by Anthony Burgess for American audiences, and his version was much darker and made much more sense in the movie. It’s classic so that’s all I’m going to say, if you haven’t watched it by now, then get home and indulge in a classic thriller!