In "Don Quijote of La Mancha," the protagonist, Don Quijote, engages in a conversation that highlights the theme of sanity versus madness. He questions another character, referring to them as "crazy" and asks if they are in their right mind. This exchange reflects Don Quijote's delusions and his commitment to his chivalric ideals amidst a world that often seems absurd to him.

The interaction underscores the novel's exploration of reality and illusion, as well as the challenges of distinguishing between sanity and insanity. Don Quijote’s quest for nobility often puts him at odds with how society perceives rational behavior, raising profound questions about the nature of reality and the human condition.