How to never grow up, the complete guide. The Encyclopedia of Immaturity contains more than 300 entries: how to ride a unicycle; how to skip a stone; how to do a wheelie; how to make the world's best paper aeroplane; how to hang a spoon from your nose; how to levitate; how to sneak around; how to really annoy your older sibling. . . All painstakingly explicated and illuminated with full-colour photographs, illustrations and diagrams, plus the occasional footnote.