Mum: Come on, Bunty, eat your breakfast and get off to school.
Bunty: I don't want to go to school.
Mum: You must go.
Bunty: But I don't want to go. The teachers don't like me, the children don't like me - even the caretaker doesn't like me.
Mum: That may be so, but you still have to go.
Bunty: Why?
Mum: Because you're the headmaster!