Kids cant get enough of laughter--so they cant get enough of Rob Elliots hilarious joke books! Knock-Knock Jokes for Kids is an all-new collection of knock-knock jokes that will have kids and kids-at-heart rolling in the aisles. Jokes like Knock knock. Whos there? Ben. Ben who? Ben away for a while but Im back now This new book from Rob Elliott is poised to reach and even surpass the more than 165,000 copies sold of his first book, Laugh-Out-Loud Jokes for Kids.