Franklin tells jokes on the school bus that amuse everyone. But when Rabbit tries to tell jokes, they fall flat. Everyone's heard them before. On the way home that day, Rabbit asks Franklin for help on being funny. Franklin tells him that he actually got all of his jokes out of a book from the library. So they go to the library where they find a great new book with practical jokes. With the new book, Franklin and Rabbit play a series of practical jokes on their friends. Everyone finds them funny, except the person that the joke is on. Finally, tired of being the butt of Franklin and Rabbits' jokes, Franklin and Rabbits' friends play a practical joke on them. However, nobody's laughing, not Franklin, not Rabbit and nobody else either. It's hard to find such a joke funny when you know how it feels. Franklin realizes that jokes are only funny when everybody is laughing together, not at someone. (thetvdb.com)