Movies so good they should be books...

I'm not sure exactly how to word this post, so I'm just going to give you two examples.

Example 1:

My kids have to dress up as book characters at school for a parade that happens to be on Halloween, but definitely has nothing to do with Halloween because we don't celebrate holidays in this city. My husband suggested my daughter dress up as Annie, but of course that was never a book. A comic strip yes, but not a book.

"That movie was so good. how come it wasn't a book first?" he said.

Example 2:

I was watching the old school version of Twelve Angry Men last night. Earlier this year I served on a week long jury, and someone suggested this movie to me. I finally got it from the library. I loved it, but knew I couldn't stay awake for the whole thing. I figured I'd find the book version and listen to it on audio at work.

It was never a book either! Much like my husband I couldn't believe it.

Does anyone else think that all good movies are based on books? Am I just a book snob?