"Knock, Knock." "Who's there?" "Isadore." "Isadore who? "Isadore open or shut?" Knock knock teeth-gritters such as this one have tickled funnybones for generations. Now, this entertaining collection of 60 knock knock gems, painstakingly selected by Victoria Fremont to appeal to all ages, puts dozens of these rib-ticklers at the fingertips of fun-loving jokesters. Accompanied by engaging black-and-white illustrations and incorporating key works that double as preposterous puns, these amusing queries provide all the ammunition you need to entertain friends, relatives, and anyone who enjoys a bit of madcap humor.