2. 'The Dark Tower'
The writing of Stephen King can morph into fierce, frightening, deeply felt cinema. Take, for example: Carrie, The Shining, The Shawshank Redemption, Stand By Me, Misery and It, just to name a few. The Dark Tower, based on the author's series of eight mythical, metaphorical novels, had enormous possibilities. But the film version, starring Idris Elba as the Gunslinger and Matthew McConaughey as his nemesis, the Man in Black, blows them all. If you want to know how to do everything wrong in book-to-screen adaptation, this model of incompetence makes for a perfect Exhibit A.