What kind of voice-over post would this be if we didn’t include one example from Film Noir? Voice-over is a staple of the Film Noir genre — maybe because crime is typically at the center of the story and voice-over naturally feels like a character testifying or telling their “version” of the story (which is also possibly why the genre is known for unreliable narrators). 

Note: This script sample features a third-person “Commentator”  who refers to the main character of Holly Martens. For the American release of The Third Man, the studio made the filmmakers change the voice-over narration to first-person from Martens himself.