Final answer:
An example of fast overlapping dialogue used to inject humor into a film is when Jack, Suzie, and Alec are walking home after work and Alec misunderstands their conversation.
Step-by-step explanation:
An example of fast overlapping dialogue used to inject humor into a film can be seen in the following scene:
Jack, Suzie, and Alec are walking home after work. Jack asks, "How was the work day?" Suzie quickly responds, "All right." Then, Jack looks at Alec and asks, "How was your day, Alec?" Alec, confused about the conversation, mumbles, "What?"
This instance of overlapping dialogue adds humor to the film by creating a comedic misunderstanding between the characters. The fast-paced back-and-forth conversation and Alec's bewildered response make for a funny moment in the scene.