Any book nerd will be happy to tell you that the book is always better. It doesn't matter if that book has been adapted into a movie, an HBO original TV series, or a hit Broadway musical: most die hard readers will jump to defend the book as the first and very best version of the story. But... what happens when the book is the adaption? Books aren't always original, but that's not necessarily a bad thing. Here are a few books that you didn't know were adaptations.
As the old saying goes, "good artists copy, great artists steal" (in the spirit of that quote, I can't quite figure out who said it first). Of course, adapting a story is not quite the same as stealing it—sometimes you even have permission. Many great writers over the years have "borrowed" stories from movies, plays, mythology, tv shows, and (naturally) other books. These aren't just those movie novelizations that you see in airports, either. Some of the all time classics of literature started out as a screenplay.
So, before you start any book vs. movie turf wars, you might want to double check and make sure that your favorite book isn't a secret adaptation: