I have read Discworld series 3 times and I'm thinking to read it all again. I wish there were movies based on Discworld but done right.
I think the three mini-series did a fairly decent job.
Pratchett was involved (and appeared) in all three.
The Color of Magic/The Light Fantastic
Hogfather
Going Postal
The Watch was kind of unWatchable for me; which is sad, because I like the actors.
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There were a couple of cartoon series by Cosgrove-Hall that were _really_ well done. (Wyrd Sisters and Soul Music)