MOVIE ADAPTATIONS THAT OVERSHADOWED THEIR BOOKS

Meaning most people don't realize they were books first.
  1. Shawshank Redemption
    Based on novella Rita Hayward and the Shawshank Redemption by Stephen King (yes that King)
  2. Princess Bride
    Book by William Goldman. I only found this out this year. WHY DID NO ONE TELL ME SOONER!
  3. 2001: Space Odyssey
    Short story The Sentinel by Arthur C Clarke
  4. Forrest Gump
    Book by Winston Groom.
  5. Psycho
    Book by Robert Bloch
  6. The Graduate
    Novella by Charles Webb. Apparently there's a book sequel?
  7. Breakfast at Tiffany's
    Maybe a stretch? By Truman Capote
  8. It's a Wonderful Life
    Short story by Phillip Van Doren Stern
  9. Rear Window
    Short story It Had to be Murder by Cornell Woolrich
  10. Strangers on a Train
    Book by Patricia Highsmith (so good!)