Harry Potter and the prisoner of azkaban
The third film in the series, this is by far the darkest up to this point. Whilst the imagery is stunning, and the clever twist at the end is well executed, for many hardcore Potter fans, the changes to some of the story lines and the character traits don't go down very well. This is still a good effort though, and you can always read the book if you want to fill in some of the gaps (recommeneded, as it actually enhances your enjoyment of the film if you do). A great addition to the first two Harry Potter films.