I watched "The Assassination of Jesse James by the Coward Robert Ford" with a friend once and he was legitimately surprised by the ending...
Seriously! I mean he should have known it anyway but even if he didn't its all laid out right there in the title.
I haven't seen it yet, but it sounds promising. A movie that *still* manages to surprise despite already telling you the ending 
Casey Affleck does an Amazing job as Robert Ford. For my money he may have even out-acted Pitt.
oh! Now I am surprised 
I watched a bit of the movie again last night and Pitt puts in a pretty darned good job himself, so Affleck really shined.