It's a zoo, it's a circus, it's a party, it's a carnival of new knock-knock jokes! There's great fun ahead with over 600 of the world's funniest gags & most hilarious cartoons to attack your funny bone. Don't knock it till you've tried it! Knock Knock. Who's there? Abner! Abner who? Abner Cadabra! Knock Knock. Who's there? Digital! Digital who? Digital anyone I was coming? Knock Knock. Who's there? Misha! Misha who? Misha since you've been away! Knock Knock. Who's there? Sinbad! Sinbad who? Sinbad and you'll never get to heaven! Illustrated with 60 hilarious cartoons by Jeff Sinclair; Bumper collection of 600 more gags from the Sterling joke factory, to add to the publisher's backlist of over 12,500 jokes!