We've known Louis for quite a while now, but at last he gets his own chapter. Louis is the yard teacher at Wayside School, and it's his job to make sure no one has too much fun at lunch and recess. (We guess that's why there are a limited number of green balls?)
But the most important thing about Louis is that he's the person who wrote this book. And yes, the real author's name is Louis too.
Because everything is backwards at Wayside School, Louis keeps all the kids indoors for a blizzard on June tenth, and comes up to the classroom on the thirtieth floor to tell all the children a story during their lunchtime.
Louis sits down while all of our friends on the thirtieth floor gather around for his story. Now that we know the entire cast of characters, everyone in the class gets a chance to pipe up during this final chapter.
Louis tells a story that starts very much the same way this book also starts: it's about a school. But this school has all of its classrooms on a single story. The kids on the thirtieth floor are baffled.
"Now, you might think the children there are strange and silly. That is probably true," Louis says, echoing this book's introduction. "However, when I told them stories about you, they thought that you were strange and silly" (30.24).
Louis goes on to describe all the things that happen at Wayside that never happen at the other school—no one gets turned into apples, and dead rats don't try to get into class. The kids are horrified.
Mrs. Jewls tells Louis that she tries to focus on the truth, saying, "[…] We really don't go in for fairy tales here" (30.46).
The class boos as Louis leaves to tell his "fairy tale" to the kids on the story below—and that's the end of the thirtieth story.