Blade Runner, I was very young when it first came out in the early 1980s and the whole look and tone of it just amazed me - and I'm a sci-fi fan. Up until then it was 2001: A Space Odyssey (still not worked out what it's all about). The other genre I enjoy is horror and two '70s films really come to mind The Exorcist (until I saw that my diet of horror was very much of the Hammer variety, so it came as a total shocker) and Carrie..which lead me to Stephen King's novels.