I am one of those people that keep reading, even though every page is a pain to get through. I have no idea why, but I just HAVE to finish a book once I started it.
However, some books you just kind of... forget about. I read about 3-5 books at a time, so slow or dull books stay on the "currently reading" pile for months. After a few months I will admit to myself; I just cannot finish this book.
Here are a few books that I just could not finish: