Favorite Harry Potter Book/Movie

What's your favorite Harry Potter book? And what about the movies? My other question is do you think they will mess up the next two movies?

My answers: My favorite book is the Deathly Hallows, there are so many surprises and questions are answered from previous books....The movies are alright, but the Order of the Phoenix missed a lot of things, but they still had good acting and a great cast....I think that they might leave out some important clues for the Half-Blood Prince, but it looks really good, and the last one is going to be spilt into two, so they will be able to fit most of it in...

I can't even read one, just watch the movies.