they battered if you put it in your pocket. The idea of paper looking guilty chimes with the idea that you're reading it in the back of the classroom when you're not supposed to be.
I mean seriously? We're so cooked if this is the "red flag".
There's like nine red flags. You are holding the English language to an incredibly low standard.
I have never seen a printed Discworld book that would fit in a pocket. Have you?
EDIT: I stand corrected, turns out they DID have pocket sized editions in France: https://news.ycombinator.com/item?id=48247127#48248586