Atonement.

UCLA Student Film, Preserved by the UCLA Film and Television Archive. Most of the story is told without words. A man is shown climbing into and then trapped inside an abandoned zoo cage. At the end of the film, the man's wife's voice is heard over a loudspeaker, asking him how it feels to be treated like someone who doesn't count, the way he treated her and his ex business partner, her accomplice. He falls to his death, and the wife and the accomplice are shown removing all evidence of their complicity.