I've been reading some of the Discworld books sporadically. Soul Music most recently.
I had read The Colour of Magic a while back and recall not liking it. More recently, a friend invited me to a Hogfather watching party. I enjoyed it enough that I went ahead and read the book. That prompted me to read the other related novels.
Plus, on the recommendation of said friend, Interesting Times. That one was kind of a miss for me. I don't care for Rincewind. Also, too much of the book felt like missed references to elements of a previous book.
Guards, Guards! might be the next one I pick up. Or maybe Thief of Time or Hogfather again.