That book drove me to madness, not because of the creepy content but just because there was so much going on in the endnotes. I'm compulsive about reading all the footnotes and endnotes in anything I read, but I generally hate having to keep one finger in the page I'm on in the main text while reading through the notes in their tiny font (e-readers are a godsend to me, as long as they handle notes decently, which not all of them do). I had a hardback copy of House of Leaves so it was a bit of a physical ordeal and my hands hurt all the time.