Fight Club. It wasn’t fun to read it felt like the author was ploying with me trying purposefully to confuse me to a point where it forced me to become disinterested. However with the movie i was captivated every second. The book’s attempt to obscure and mystify the reader might have been an intentional stylistic choice, but for me, it didn’t translate well.
I get all of that and I still think the movie is the more impressive work of art. An adaptation doesn’t have to be 100% true to the source material to be good. Basically I feel Kubrick is a better filmmaker than King is a writer.