"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.