Originally Posted by RustyCage
Another example: RDJ's Sherlock Holmes (even though I prefer Mr. Cumberbatch, but that's beside the point).
That's what I thought of when I tried to recall a film with self-narration. There's also the fan-film City of Scars and it worked well there IMO.
I wouldn't want it for everything but it would be a way of demonstrating how Batman's mind works, especially if they had him in a scene portraying Bruce eg at a party, but underneath he's thinking about tactics or something.