Roald Dahl wrote 16 children's books, not counting short-story collections, between 1961 and his death in 1990, but only six have been turned into movies (including two TV productions). While Dahl himself dabbled in screenwriting, including the adaptations of Ian Fleming's You Only Live Twice and Chitty Chitty Bang Bang, he was generally displeased with the film versions of his own stories. He went so far as to disown the 1971 adaptation of Charlie and the Chocolate Factory, which was altered to…