Download or read book Knock Knock! written by Highlights and published by National Geographic Books. This book was released on 2017-10-03 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Knock Knock! is the best book of knock knock jokes ever! This hilarious, 352-page humor collection features more than 1,000 knock-knock jokes and cartoons covering lots of kid-friendly topics. Kids will love amusing themselves—and friends and family—with this ultimate knock-knock collection.