It does happen.
It's true that movie adaptations rarely live up to the books they're based on.
Disney / Via memegenerator.net
But sometimes, just sometimes, the movie is actually better. Like The Notebook, for instance...
There was no Ryan Gosling in the book.
New Line Cinema
Or The Godfather.
Paramount
Or even, dare we say it, Fight Club.
20th Century Fox
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Which Movie Adaptation Is Actually Better Than The Book?