19 science fiction movies that could change your life

There are plenty of classic SF movies you should see, from James Whale’s Frankenstein to George Lucas’ Star Wars: A New Hope. And there are plenty of beloved SF movies like Steven Spielberg’s E.T. But what about science fiction movies that challenge your preconceptions about reality and force you to rethink your place in the universe? Those aren’t always the most famous movies, but they are certainly the most memorable. Here are nineteen SF movies that could rearrange your mind. A few of them have already changed the way we all think about tomorrow.
No list like this could ever be complete. Add your ideas in comments below.