Oh, that's a tough one...Wow, I guess if I'd have to choose then I'd go with The Dark Knight, The Notebook, Lord of the Rings: The Two Towers, Wall-E and Fight Club. Fight Club and Dark Knight are excellent keep-thinking films, LOTR is LOTR (no explanation needed), Wall-E is just too adorable not to bring because it'll keep me amused if I get stressed on that island and The Notebook will remind me that there's love in the world.