This situation was often referred to as the "automatic joke point." When a reader read a novel, they would trigger their sense of humor in certain plots, characters, or conversations, causing them to laugh unconsciously. There are many reasons for this phenomenon, some of which may include: 1. Plot Coincidence: When the plot of the novel appears to have some seemingly unusual or unexpected coincidence, the reader may feel a natural sense of humor. Character characteristics: The characters in the novel usually have their own unique characteristics and behaviors such as intelligence, stupidity, kindness, selfishness, etc. When readers see the characteristics of these characters, they may feel that they have some connection with these characters and trigger a sense of humor. Conversation: The dialogue in the novel is usually an important part of the story. When the reader hears some interesting dialogue, he may feel a natural sense of humor. 4. Emotional resonance: The reader may feel emotional resonance in certain plots or characters, such as sadness, joy, loss, etc. When these emotional resonances are triggered, the reader may feel a natural sense of humor. The automatic punchline might be a result of a combination of many factors. Different readers might have different reactions to the same novel, which also showed the ability of the novel to shape the reader's emotions and cognition.