Book Hunt

Why do patrons feel the need to hide books? Is it some sort of childish competitive game? I have been finding all sorts of "missing" books lately. They have been stuffed in every place imaginable. I usually have to go one a hunt when there's an exam coming. That is when the students get really fussy and do all sorts of silly things, like hide a book in the false ceiling thinking the library staff will never find it. This makes me wonder of places I haven't thought about. Time to get creative.