This has annoyed me for years. I think of this post as a catharsis.
I hate it when people open a hardback book, bend the spine until the two covers touch each other and break the spine of the book.
It annoys me when it is done with paperbacks, but when it is done with a hardback it really gets me deep down.
I don't know why this is but I just find it very difficult to watch. In fact the sound it makes is even worse.
Sorry about that, but I feel better now.