What are books you don't want to finish, haven't finished, or have reread, for either positive or negative reasons?
For example, "Wintergirls" is my favorite novel, and I am literally always in the middle of reading it. I've read it so many times, I have the majority of it memorized. I have one copy of it in hardcover, several copies in softbound, (a friend of mine sent me a few with different covers for Christmas last year), a copy in my e-reader, and the audiobook on my computer and the three iPods I've purchased over the years.
Despite my love of reading, I'm typically a slow reader, and sometimes I'll lose focus halfway through a book. But the book "Tiny Pretty Things" - and it's sequel, "Shiny Broken Pieces" - are books I have a ton of fun reading, despite their not-so-fun subject matter. I've read the first book twice, and I'm currently in the middle of my second time reading the second book. I'm reading it slowly, because I don't want it to be done.
On the other side of that, I have books I dislike so much, I've never finished them. Despite my enjoyment of classic literature, I hate "The Scarlet Letter". I never even bothered to finish it when it was required reading in high school, and just used cliff notes in order to do the work required for the class.
I also hate the book "The Miseducation of Cameron Post". Not just because of the subject matter, but because it was like the author had no idea when to end a paragraph. They just went on and on. I never finished reading it, and I hated it so much, it was the only book I ever threw away. Usually, when I don't intend to read a book again, I'll give it to someone, or sell it online. But I hated that book so much, I didn't even want other people to get their hands on it. So I literally put it in a trash bag and threw it out.
I'm a writer, myself, and I have a certain level of respect for anyone who manages to not only write a book, but have it published, as well. The idea of throwing away a book is like sacrilege to me. But I hated that book so much, I threw it right out.