Things are not always as they seem

"In her book Anger: The Misunderstood Emotion, Carol Tavris recounts a story about a Bengali cobra that liked to bite passing villagers. One day a swami—a man who has achieved self-mastery—convinces the snake that biting is wrong. The cobra vows to stop immediately, and does. Before long, the village boys grow unafraid of the snake and start to abuse him. Battered and bloodied, the snake complains to the
swami that this is what came of keeping his promise.
“I told you not to bite,” said the swami, “but I did not tell you not to hiss.”"

- Susan Cain - Quiet