Don Key (Son of Burro)(1926)

The head of a big movie studio is pulling his hair out because the company is bankrupt unless they can find a writer for a smash comedy. An aspiring writer is awaiting outside the office and the producer agrees to see him. He listens while the writer tells his story and acts the numerous parts. The story is rotten, but the producer lets him escape while vowing vengeance on any other author who would read his story aloud.