^*The smallest room in Unseen University is in fact a broom cupboard on the fourth floor. He really meant the privy. The Reader had a theory that all the really good books in any building—at least, all the really funny ones**—gravitate to a pile in the privy but no one ever has time to read all of them, or even knows how they came to be there. His research was causing extreme constipation and a queue outside the door every morning.
**The ones with cartoons about cows and dogs. And captions like: “As soon as he saw the duck, Elmer knew it was going to be a bad day.”