A master villain breaks into your house and ties you to a chair with a gun at your head. "I'll let you live if you kill one person for me" he sneers. "No you dastardly individual, I would never take the life of another human being!" you valiantly shout. He holds up a picture of the person he wants you to kill. Why, it's your ex! You decide to go along with his demands, amirite?