Best film adaptation of a book?

Question:

Best film adaptation of a book?

i was thinking that the shining really did the book well, i read the book first and thought the film captured the feel (ie craziness) and bleakness of the book very well.

Best Answer - Chosen by Asker: "The Maltese Falcon" follows Dashiell Hammett's book perfectly.
"The Godfather" (1 and 2) are brilliant adaptations