What's Your Favorite Harry Potter Film?

If you're one of the many fans who has already purchased tickets to see Harry Potter and the Half-Blood Prince, then you may have spent the weekend watching the first five films in the series — or at least your favorite of the bunch. Personally, I'm a huge fan of the fourth book (and casting Robert Pattinson in the film version didn't hurt), but if I had to choose my most-loved movie, it would be Alfonso Cuarón's Harry Potter and the Prisoner of Azkaban. It was slightly darker than Chris Columbus's first two, and, for me, much more magical than the two that followed. Do you agree or do you prefer another?