The knock-knock joke- a kid classic. So many funny, punny punchlines. It was just screaming for its own book. To do this classic joke justice, we decided to gather fourteen of the best-known and most talented children's book artists to illustrate their favourite punchlines. The results are wacky, zany, and absolutely hilarious. If you knock on Tomie dePaola's door, beware! Is that a girl or a gorilla? Who's knocking at Saxton Freymann's door? Just a couple of talking lettuces. Talking lettuces?! One impatient cow can hardly wait to get through Laurie Keller's door, and David Small has a surprise waiting for his intruding vampire. In this collection, you'll recognize some of your favourite jokes and be surprised by new ones. But one thing is certain- Each time there's a knock, you'll want to answer the door!