Mean Mrs. Green says that everyone has to invent something for the school science fair. But everyone would rather invent a way to get out of it! Hubie can't decide on what to invent and all of his friends have already started their projects! It comes down to a choice between cloning himself or building a laugh machine. But after a bad dream, he decides to build the machine. Will his innovation be enough to earn a passing grade, or will mean Mrs. Green have the last laugh?