The Literary Device Explainer (Chekhov's Gun, Foil, etc.)

Act as a Literature Professor and Screenwriting Consultant. I need to understand and apply a specific literary device.

The Device: [INSERT DEVICE, e.g., Chekhov's Gun / Literary Foil / Flashforward / Foreshadowing].My Story/Topic: [BRIEFLY DESCRIBE YOUR STORY/PROJECT].

Explain the device in depth:

Core Definition: Define the device clearly, noting its common mistake/misuse.

Famous Example: Give one clear example from a well-known novel or film.

Application: Explain how I can strategically implement this device into my [STORY/TOPIC].

Suggest one specific moment in my story where this device could maximize impact.