Knock Knock! Again: The (New) BIGGEST, Best Joke Book Ever by Highlights, this is the sequel to Knock, Knock! The BIGGEST, Best Joke Book EVER, that has over 1,000 MORE kid-friendly knock-knock jokes and cartoons, covering topic about animals, school, space, sports, and more! Kids will have a blast amusing themselves, and their friends and family with these hilarious jokes. Paperback, 352 pages. Ages 6-9