New best story on Hacker News: Ask HN: Great fiction books that have had a positive impact on your life?

Ask HN: Great fiction books that have had a positive impact on your life?
419 by sondog | 409 comments on Hacker News.
It seems like most book recommendation threads end up being filled with a load of self improvement type books. Do you have any fiction book recommendations that have positively impacted your life? Maybe a book that helped you through tough times or made you change your outlook on life?