My wife was like that when we first got married. She would go nuts and hit me and hurt herself (she's not very coordinated). One time she threw a brush at me and it bounced off and hit her. Another time she hit me and bruised her arm. After a few times she learned and doesn't do that any more. Some women are like that so it's quite believable that she head butted him. By the way, my wife isn't some bimbo. She's a very successful lawyer.