Of course this is a reaction to the REMAKES thread.
Also in this thread you could list books or cartoons that should never go to film in the first place (The Flintstones come to mind).
Fight Club (Fincher nailed it, Pitt and Norton can't be beat).
The Dead Zone (nobody can match Walken's portrayal).
The Metamorphosis - I've come to realize that nobody would be able to put this classic book to film properly.