One settles back in anticipation: this, you sense, with the talent on board, is the happiest, funniest idea in years. Black (John Belushi meets Mary Poppins) is impossible to dislike, and Joan Cusack plays the school's uptight headmistress as a woman on the verge of a long-deferred first orgasm of incalculable scale and violence. Plus you get to see a marvellous scene in which pre-pubescents gradually put together Smoke on the Water.