Knock, knock. Who's there? Broccoli. Broccoli who? Broccoli doesn't have a last name, silly! The bestselling jokesters The Hennessy Kids are back again to make you laugh - now with their second book of knock knock jokes! Knock on all your family & friends' doors and share this great collection of jokes with them so you can all enjoy laughing & groaning together for a fun time. The Hennessy Kids are authors of several bestselling joke books, and are always looking for fun stuff with heart.