" Then all at once she turned to me, her face pale, her eyes strangely alight. She said, “Is it possible to love someone so much, that it gives one a pleasure to hurt them? To hurt them by jealousy, I mean, and to hurt myself at the same time. Pleasure and pain, an equal mingling of pleasure and pain, just as an experiment, a rare sensation? "

― Daphne du Maurier , The Doll: The Lost Short Stories