This hilarious collection contains 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. Illustrations. nThis 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.