How about, “What’s the worst ‘best’ book you’ve ever read — the one everyone says is so great, but you can’t figure out why?”
Mine would definitely be Wuthering Heights. I was so excited to read it, but for some reason, I just couldn't get into it. I found it so boring! And since then, I have been scared to read other classics like Pride and Prejudice because I want to like them so much but don't want to be disappointed.