This seems to come up a lot, but no, I am not a Pratchett fan. I'm not saying anything against his work, I'm just saying that I never managed to read it before OOTS took off, and now that it has, I consciously avoid it so that I can be sure that my ideas aren't being influenced.
So much so that I don't actually understand the OP's point and how an orangutan reading a book is a Pratchett reference. I selected photos of various primates in positions that lent themselves to reading, playing games, or wearing t-shirts. No reference intended.