One day, Mullah Nasruddin heard a knock on his door. He opened the door and found his daughter standing there crying with a bruise on her eye. “What happened?” Nasruddin asked. She said that she got into a fight with her husband and he beat her. To his, Nasruddin responded by slapping his daughter in the face. He closed the door and quickly called her husband. When he picked up the phone, he told his daughter’s husband, “I heard about what you did, but I’ve had my vengeance – because you hit my daughter, I slapped your wife, take that!”.