Sam and the Peanut Butter Crackers

In the story, Sam and the Peanut Butter Crackers, a young boy tries a new snack for the first time. Little does he know that the only words he will be able to say are "Mmmgumpf" when the peanut butter gets stuck to the roof of his mouth. How will he explain the rules of "Green Grass Monster" to his friend Harry or to his babysitter Stephanie? Soon he will find out that his babysitter is not so ordinary after all.