What's Your Favorite Book?

Lately I've been wondering what books I should read, should I read this? Or maybe this? Or that? You know what I mean. So, I want you guys to comment on this post telling me your favorite book and why, and then I will pick the best comment that explains why they love the book, I will make sure to read it, and I will review it on here. If you have a blog, then just create a post on your blog stating your book and put a link of this post in it. I would LOVE it if you guys participated! Thanks!