And the film never has the full story. You can't fit everything into 2 hours! I read all Harry Potter books before films. Have to admit that I saw Twilight before reading the book. I then read the book and all that followed. Much more info in books.
I'm trying to get my other half to go see Paranormal Activity 3 w me -- the previews look damned scary! And I heard the last 30 minutes will mess you up!
Put it this way ~ it was almost dark when we walked outside ~ I was glad it was not all the way dark! You will like it! There was a preview of one coming up: