JoJo is excited about a project in her clown class to make new things. Peaches offers her some popcorn to take along, but finds that the kernels in the strange unmarked bag found in the kitchen cabinet won't pop. JoJo decides to take the bag to school and once there, Mrs. Kersplatski has the class making all sorts of neat things with them. They then discover something very special about the popcorn. It's actually a special kind of popcorn that pops whenever they laugh.