Katrina is complaining to her landlord about the six-inch long cockroaches in her apartment. The landlord scoffs, saying: "Cockroaches don't get that big! I'll pay $10,000 to anyone who can show me a six-inch cockroach." Will, a bug collector, overhears and promptly presents the landlord with his prize six-inch South American cockroach. The landlord refuses to pay, and Will sues. Which of the following best describes the situation?