Klutz The Encyclopedia of Immaturity: Volume 2 Book The Encyclopedia of Immaturity has been such a hit that we've followed up with a second book that's hopelessly goofy and shamelessly wonderful. Comes with: shenanigans galore A 200 page book with thought-provoking topics such as How to Slide Down a Banister, How to Send a Toiletgram, and more. Recipient of the National Parenting Award Recommended for children ages 8+