Melissa’s Reviews > Harry Potter and the Prisoner of Azkaban > Status Update

“I thought we’d seen the worst when we bought two hundred copies of The Invisible Book of Invisibility—cost a fortune, and we never found them ...”

Maybe this guy was conned, but there's also a book on the syllabus that attacks you and rips out its own pages, so a great deal of The Wizarding World education is just counterintuitive and stupid to begin with. I don't blame him.