Upside Down
This one was probably a mistake, and not something the publishing house did on purpose. It’s very likely this was not the only copy that had this mistake; they may even run by the thousands, if this was a mistake in the assembly line! But it also seems pretty likely this is a one-of-a-kind book.
This person ordered a Harry Potter book, and as they were reading it, they turned the page and found out one of the pages was printed upside down. This may actually not be a waste. There are so many Harry Potter fans in this world, we’re sure that if you put this book out for sale, there are a lot of people that will pay to have one.