A Chinese girl named Li-li got married and lived with her mother-in-law. Since the mother-in-law was obnoxious, Li-li decided to kill her. Li-li went to her doctor to get slow-acting poison. The doctor said, “Just so that people don’t suspect you, treat your mother-in-law very nice, as you’d like to be treated.” So Li-li was nice to her mother-in-law as she slipped a little poison into her food each day. Now a funny thing happened: the two started getting along much better and became best friends. So Li-li went back to the doctor and said, “I now love my mother-in-law and don’t want to kill her; please give me something to counteract the poison.” The doctor replied, “I gave you ordinary vitamins; the only poison was in your attitude.”