This is no ordinary collection of knock-knock jokes. It's extra crazy. Extra hilarious. Extra spontaneous. And this new offering from master of laughter Bob Phillips will require extra stamina from parents whose kids own this fantastically funny joke treasury. When kids get squirrely on road trips, in waiting rooms, or during family game night, Extra Nutty Knock-Knock Jokes for Kids will make everything all better. In the world of knock-knock books, this one demands to be answered, again and again, for a giggle-a-thon suited for all ages.