MORE THAN 1 MILLION COPIES SOLD!Knock knock.Who's there?Ben.Ben who?Ben away for a while but I'm back now.Kids can't get enough of laughter--and they can't get enough of Rob Elliott's hilarious joke books! Kids (and their adults) are looking for clean, lighthearted humor--and Rob Elliott delivers.Now the author of the bestselling Laugh-Out-Loud Jokes for Kids offers this all-new collection of knock-knock jokes that will have kids and kids-at-heart busting a gut and asking for more.Also available:? Laugh-Out-Loud Jokes for Kids? Laugh-Out-Loud Animal Jokes for Kids? More Laugh-Out-Loud Jokes for Kids? Laugh-Out-Loud Puns, Jokes, and Riddles for Kids? The Big Book of Laugh-Out-Loud Jokes for Kids 3-in-1 Collection? The Complete Laugh-Out-Loud Jokes for Kids 4-in-1 Collection