Nearly two decades later, Noah and Allie's love story is still sweeter than ever. Back in 2004, The Notebook, based on Nicholas Sparks' best-selling novel, came out of nowhere and not only became a surprise box office hit but also turned Ryan Gosling and Rachel McAdams into one of Hollywood's most beloved onscreen couples. But did you know the two actors actually couldn't stand each other while filming the movie? Or that a very famous pop star was brought in to read for Allie before McAdams landed the part? Oh, and way before Gosling nabbed the swoon-worthy role, Tom Cruise was actually attached to star in the movie. (That's a hard one to picture,...