Most good stories start with a fundamental list of ingredients: the initial situation, conflict, complication, climax, suspense, denouement, and conclusion. Great writers sometimes shake up the recipe and add some spice.
Because this book is backwards, sideways, and sometimes upside-down, it doesn't have anything like a traditional plot structure. Sideways Stories from Wayside School is a collection of thirty mini-stories, each one with its own problem and punch line. So in the spirit of the famous nineteenth story of Wayside School, which doesn't exist, we'll just say this about the plot of this book: There is no plot. The author forgot to write one. He is very sorry.