The quote reflects a conversation between characters in Margaret Atwood's "MaddAddam," where Zeb suggests that humor can emerge even in dire situations. The phrase "heart like shale" implies a tough exterior, hinting at resilience amidst hardship. The suggestion of needing "a good fracking" serves as a metaphor for breaking through emotional barriers to access deeper feelings, perhaps even joy in difficult times.

This exchange encapsulates the book's exploration of human emotions and connections in a world shaped by environmental challenges. Atwood uses these characters to illustrate the complexities of laughter and vulnerability, emphasizing that humor can be a vital coping mechanism in the face of adversity.