Voiceover as Seduction
Giving the narrator a voice so intimate, witty and self-aware that you get pulled into their point of view. You find yourself going along with things you would normally reject.
Goodfellas
Henry Hill's narration opens with 'As far back as I can remember, I always wanted to be a gangster'. For the entire first half of the film, Scorsese makes that desire infectious. The narration is proud, funny and energetic. You're meant to share in it before it gets stripped away.
The Wolf of Wall Street
Jordan Belfort's voiceover is a sales pitch aimed at you. He explains his schemes with the enthusiasm of a man who loves his work, and Scorsese makes him convincing. That is the film's ethical challenge. By the time you dislike Jordan, you have already enjoyed everything he did.

