You can run but you can't hide! Elementary-age comedians are about to discover a bunch knock-knock jokes, and they'll be trying them out again and again! Kids will fight off the supervillian of boredom as bestselling funnyman Bob Phillips knocks at your door with a book packed full of knock-knock jokes. The quirky quips and wacky wisecracks is just the ticket for good, clean fun! Recommended for ages 7 to 12.