On a sunny morning the teacher's invites her students to sing.
Teacher: "Children, let's sing Cut Songs of Ducks Goose!".
Children: "Yes, the teacher's ..."
teacherr: "teacher counts yes children .. one, two, three"
Children: "Cut a goose duck, goose in a cauldron, lady ask for dance, dance four times, shove left, shove right, tralalalalalal ...
Amid their preoccupation singing, suddenly came the principal's teacher.
Headmaster: "How the hell does this teacher, already know the children are still under age, how come Dance Miss Dance, that's her father's business".
teacher : " ???!!!###" 
Could you please explain what's so funny about this, because I haven't got a clue ....