Score some laughs in this collection of sports jokes! Baseball, Basketball and Soccer can't compete with the belly busting workout of a good laugh! Knock Knock, Play Ball is filled with funny jokes for kids joking around on and off the field. Each page features one illustrated joke. Here's a silly sample: Why do basketball players love donuts? Because they can dunk them! Knock Knock, Play Ball is part of the Illustrated Jokes series. Other titles include: Fart-tastic Too School for Cool Knock Knock, Boo Who? Knock Knock, Moo Who? It's Snot Fair! Knock Knock, Lettuce In! Knock Knock, Blub Blub! Wait, What? Knock Knock, Olive You Yo Ho, Ha Ha Knock Knock, Jingle Jingle Knock Knock, Meow Meow Knock, Knock, Woof Woof! and more!