In "The Mark of Athena" by Rick Riordan, a humorous exchange takes place between Piper and Percy, highlighting their playful dynamic. Piper remarks about a hole, leading Percy to respond with excitement about having a "dam hole," which he finds hilarious. His laughter suggests that there's an inside joke that Piper is not clued into, adding to the lightheartedness of the scene.
While Piper is confused about Percy's laughter and dismisses it, Percy's humor underscores the camaraderie among the characters. This interaction showcases their friendship and serves as a moment of comic relief amidst the serious adventures they face.