I've read all the Discworld novels, some of them more than twice. Also appreciating Good Omens, which might be one of the most awesome literature team-ups ever with Neil Gaiman joining Pratchett.

Also am currently reading truckers to my son.

Have read all of them except Good Omens (keep on forgetting). I hope he gets to write a few more.

I have read them all at least twice, including Good Omens. The light fantastic is not a good place to start, not only is it a direct sequel (the only one), but it is a sequel to the worst book in the series, and a terrible book itself. Interesting Times is pretty good, but it is kind of a sequel to the Light Fantastic, and you may miss some of the humour.

I usually recommend beginning from Mort, which really is quite a good book. Terry Pratchett is one of the few authors, however, where each book is pretty much always better than the previous one, so picking up a late book might be a good idea (but in some cases, could spoil some of the previous ones)

^I haven't started at the light fantastic, I have read The colour of magic twice.

I've also read Mort lol