Mr Grumble Book 41 by Roger Hargreaves - "Bah!" says Mr. Grumble. He hates laughing; he hates singing; he hates people who pretend to be clowns. And he hates being turned into a pig; which is exactly what happens whenever he grumbles. Luckily the wizard's spell works it's magic, and Mr. Grumble stops his moaning in order to stop himself oinking.