Don Quixote
By Miguel de Cervantes

Among the misadventures of Don Quixote, I always remember the novella of The Man Who Was Recklessly Curious, which is about two dear friends. One falls for the prettiest woman in town. Their marriage is unimaginably good, except the man can't help but test it. He convinces his friend to woo his wife, to see if her love is real. Short story—it ends in disaster. For me, those few chapters are the best example of why you don't mess with perfection.