"Ha! Ha! Ha!" is a treasure trove of choice jokes, intriguing puzzles, challenging riddles, brainteasers, word games, and amazing facts, from simple knock-knock jokes to knock-'em-out brain bogglers. Organized by theme, related factual sidebars provide tons of fascinating information like why elephants are wrinkled and how they use their ears to keep cool in the African sun. Children will love the classic Doctor, Doctor jokes and silly book titles such as "Great Mysteries" by Hugh Dunnit and "The Contest" by Willie Win and Betty Can. Add to this chortle-fest Dianne Eastman's bold, goofy, and witty illustrations, and this book is a riot of educational entertainment.