A woman goes to the doctor for help, because every day her husband comes home from work, he beats her. The doctor tells her to fill her mouth with water and swish it around when he arrives at home. She should keep doing this every day. A week later, the woman sees the doctor in the street, and runs up to him to thank him for the wonderful advice. She says her husband hasn't lifted a single hand to her. She asks the doctor what wonderful water swishing technique this is and what is the purpose of swishing the water in the mouth, and how it solved her problem. The doctor replies "Oh there's no technique to it really. It simply keeps your mouth shut".