After I've finished my cup of tea. It has a bit of an odd flavour though. Did you add almonds or something?

I'd say that while Pratchett's books are wider in intended audience than Dahl, there does seem to be care taken with pretty much all of them not to include anything that would cause an adult to tell a child not to read them. As a child, I never had any adults tell me that I should not be reading Pratchett at my age, which was a fairly common occurence with much of what I was reading.