Before I was reading science fiction, I read Hemingway. Farewell to Arms was my first adult novel that said not everything ends well. It was one of those times where reading has meant a great deal to me, in terms of my development - an insight came from that book.
2001: A Space Odyssey was a wonderful conundrum when I was a boy, with its giant concepts thrown across the giant screen at Indian Hills Theater. That movie woke me up in ways that I hadn't imagined, and I went searching for book versions of the same drug.