For me it was "The Man Who Was Thursday" by Chesterton, and it's not a highly intellectual work, if anything it's a very short read, but it has a strange abstract nature to it that I always knew where it was going but didn't quite know how it would get there, except for the ending which best captured that "it's all a bunch of crap" mentality. So for me it wasn't anything said in the book, it was just a fun read that did things in a different enough way that made it fun and the takeaway was just that sometimes it doesn't matter.
I also just like the different covers people have come up with over time for it as each represents a topic in the story but doesn't really give away what the story is about as each contradicts the other.
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