An awesome gallery over at Imgur.com, shares a bunch of well-known movie posters, edited to have the titles of the book the film is based on. Did you know that these movies were based on books? Some of the most surprising for me when I found out, were that Mean Girls was based on the self-help book Queen Bees and Wannabes by Rosalind Wiseman, and that Clueless was loosely based on Jane Austen’s 1815 novel Emma. I had no idea that Slumdog Millionaire was based on a book as well: Q&A by Vikas Swarup! Thanks to Ciara M. for the tip. Check out the gallery below, and let us know which ones surprised you the most!