I might be the last guy on here but I recently read "Jaws". I have had the movies part I-IV since I was a child and can pretty much quote them back to you.

I was surprised how far the book and movie differed. From the affair with Hooper, to the mafia involvement, to the way quint died and lastly how the shark died.

I think that's one time I can recall that the movie and book were polar opposites but they both came off as equally intriguing.