In "The Titan's Curse" by Rick Riordan, a character named Grover is feeling down, and it's evident that his emotional state is affecting him deeply. The narrator recognizes that if they don't uplift Grover's spirits, he may either express his sadness by crying or resort to his unusual habit of destroying household items, like the mattress. Grover has a tendency to chew and consume objects when he is distressed.

This situation highlights Grover's quirky yet concerning behavior, which adds a humorous yet serious tone to the narrative. It showcases the importance of friendship and support in overcoming challenges, as the narrator feels a sense of responsibility to help Grover navigate his emotions and avoid further turmoil.