The Joker's jailbreak joke in the movie could be understood as a kind of black humor, but it also hinted at the complexity of the plot and the relationship between the characters in the movie. In this joke, the clown played the role of a criminal psychologist who helped criminals escape by analyzing their psychology. In this joke, the clown mentioned a prisoner who escaped from prison and told him,"If you want to escape from here, the best way is not to try to find an escape route, but to open every door in the prison and leave." The meaning of this joke was that the clown was mocking the criminal's ignorance and self-righteousness. As a criminal who escaped from prison, he tried to find the right escape route instead of trying to open every door and risk going out himself. The clown's joke hinted at the criminal's naivety and immaturity, while also revealing the complexity of the relationships between the characters in the movie. The humor of this joke was that the clown used black humor to satirize the criminal's behavior, and this black humor also reflected the complicated plot and character relationships in the movie.