Question like that

Joyce, a teacher, was asking schoolboys what their parents did for a living. What does your mother do all day? asked Joyce. Bob stood up and proudly said: She's a doctor. That's wonderful. How about you? Joan shyly stood up, scuffed her feet and said: My father is a mailman. Thank you Joan, said the teacher. What about your father? Mike proudly stood up and announced: My daddy plays piano in a bar. The teacher was aghast and promptly changed
the subject to geography. Later that day she went to Mike's house and rang the bell. Mike's father answered the door. The teacher explained what his son had said and demanded an explanation. Mike's father said: I'm actually an attorney. How can I answer a question like that to a eight-year-old?