Worst Adaptation

One Day - this movie didn't "wow" me at all.
But the book - ah, the book was great!
Taken from Google Images

I think that we can all agree that F. Scott Fitzgerald's "The Curious Case of Benjamin Button" was adapted into a pretty stellar movie.  For this journal prompt, I want you to think about an adaptation of a children's book, short story, novel, novella, graphic novel (etc) that fell short, leaving you disappointed.  Be sure to explain why the movie fell short and what the director, screenwriters, actors (etc) could have done to make it better.