COMPANION TO: THE BIG BOOK OF KNOCK-KNOCK JOKES, ISBN 9780063080669. From Rob Elliott, the author of the #1 bestselling 'Laugh-Out-Loud Jokes for Kids' series, comes 'Laugh-Out-Loud: Dad Jokes', an all-new collection of hilariously groan-inducing jokes that any kid would love to hear their father tell. Ages 6 to 10