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This is a one-of-a-kind illustrated knock knock jokes book, by the #1 children's books bestseller 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 e...