 FACT: When Dr. Zeigler visits the institution for mentally unstable  criminals in which Graham is hospitalized, the director of the  institution says, referred to another patient: "Vulpes pilum mutat,  non mores", saying it means "The leopard never changes his spots".  Graham corrects him, saying it means instead: "The wolf changes its  fur, but not its nature". Actually, "vulpes" means "fox".