"The follow-up to LOL: A Load of Laughs and Jokes for Kids, this jam-packed knock-knock joke book is perfect for young comedians! With over 600 jokes, this book is ready to knock down your door with hours and hours of the wackiest (3z(BWho’s There?(3y (Banswers ever. Perfect for sharing with friends, Knock-Knock! Who's There?: A Load of Laughs and Jokes for Kids will have your young comedian howling with laughter!