Frame Narrative as Trap
Wrapping the story inside another story that turns out to be a trap or a deception. The listener, or you as the viewer, gets locked into the teller's version before realizing what it is for.
Citizen Kane
The 'Rosebud' investigation holds the film together. A reporter gathers testimony to solve the mystery of Kane's last word. That setup promises an answer and gives you only contradictions, since every witness describes a different Kane. The investigation ends and the reporter never gets his answer. Only the audience sees Rosebud burn, and it explains nothing.
Amadeus
The asylum confession frames the story, so Mozart's whole life reaches you through Salieri's wound. You get no neutral view of who Mozart was. You're locked inside the worldview of the man who destroyed him, and you have to judge genius through the warped lens of envy.

