"Who"s there?" is the best set up line in comedy history. Now kids of all ages can knock hilarious jokes out of the fun park. Friends, family, and fellow-jokesters will be rolling in the aisles with laughter and secretly taking notes.This collection of the crazy and zany is from Bob Phillips--which means everyone who hears these comic gems will laugh hysterically and fall to the ground in awe of the most awesome knock-knocks ever invented.