Knock, knock jokes are the classic jokes No one remembers when the first knock, knock joke made its appearance. It seems like they have been around forever. Everyone knows at least one knock, knock joke which is what makes them so great They can be ironic, amusing and downright hilarious Maybe it isn't clear what makes a knock, knock joke so funny but, it is clear that everyone loves to hear them. "100 Knock, Knock Jokes" is a collection of 100 of the funniest knock, knock jokes that you can use to make other people laugh. Get a copy of this book today, if you are interested in making your friends and family laugh. Make sure to memorize these knock, knock jokes and have a fun and wonderful time with your family and friends.