In "The Son of Neptune" by Rick Riordan, a character expresses frustration by calling another a "schist," which refers to a type of rock, but in this context serves as a humorous insult. The use of "schist" highlights the character's anger and adds a playful element to the dialogue. Hazel reacts with surprise, indicating that this unexpected insult takes her aback.

This exchange illustrates the blend of seriousness and humor typical in Riordan's storytelling, where characters often face dire situations but use wit and sarcasm as coping mechanisms. The playful banter among characters is a signature style that enhances their interactions and deepens the reader's engagement with the narrative.