I read about a little boy named Jack. His mother heard him screaming and ran into the bedroom to find his two-year sister pulling his hair. She got the little girl to let go of his hair and then said to Jack, “I’m sorry. She didn’t mean it. She doesn’t know that hurts.”
The mother was barely out of the room when she heard the little girl scream. She ran back into the bedroom, “What happened?” Jack said, “She knows now!”