This is a one-of-a-kind interactive illustrated knock knock jokes book, by the #1 children's books bestselling author and illustrator of "Tongue Twisters for Kids." Each Knock Knock joke features two illustrations; one as if you are looking through a peep hole on a door with someone (or something) knocking, and the other illustration featuring the punch line. Kids will find this book hilarious with the unique colorful cartoony illustrations and the silly knock knock jokes. Find out 'Who's there' behind each door, in this book of humor that features over 50 silly illustrated pages filled with funny knock knock jokes for kids. Features: * Over 50 pages of interactive knock knock jokes for kids! * Audio narration of every joke, with highlighted wording so kids can easily follow along! * Two silly illustrations for every knock knock joke! * Hotspots on every page so kids can more fully be entertained with silly sounds and sayings! * Fun for the whole family!