Watching your book be adapted into a film can be a challenge for an author. At Vulture, John Green discusses his involvement in The Fault in Our Stars adaptation, which he has nothing but positive things to say about. “It was a joke on the movie that I cried every day. But I cried every day because they were good every day!” The film’s full trailer was released this week, and in case you still haven’t read the novel, here’s our review.