The Encyclopedia of Immaturity by the editors of Klutz

From chapters.ca:
This compendium, our collective kid- brain between the covers of a book, was in the works for 30 years. With over 300 entries - everything from How to Do a Wheelie to How to Hang a Spoon from your Nose, and How to Levitate - it's our effort to teach a skill essential to something we think is a very important part of living right: never growing up.