I lent a recipe book to a friend and she had it for about two weeks. When I got it back I put it in the cupboard and thought no more about it. I just got it out to bake muffins for ds and several pages have their corners turned down. I don't turn the corners on any of my books and I wouldn't think to do it on a borrowed book. I know it's really not important but AIBU to be a tiny bit peed off? 