In Ian McEwan's novel "Sweet Tooth," a unique metaphor emerges through the statement, "Arguing with a dead man in a lavatory is a claustrophobic experience." This phrase captures the tension and isolation one can feel when engaging in futile disputes, reflecting on the constricting environment that amplifies feelings of entrapment and frustration.

The imagery of a lavatory emphasizes the confinement of the situation, suggesting that arguing with someone who cannot respond leads to a profound sense of loneliness and despair. It highlights the complexities of communication and the psychological struggle involved when confronting unresolved issues or past grievances.