I just had a flash of a character, a man who sees an attractive woman on a train reading a book. He gets the book in order to be able to strike up conversation with the woman, or, hoping that, seeing that he's reading the same book she is, she'll strike up conversation with him. Maybe he notices occasional glances from her, but she never says anything. He keeps doing it for a few books, hoping, but then he decides that she's never going to say anything, and he just can't bring himself to say anything. But he keeps reading whatever she's reading, finding that he actually likes the stuff, stuff that he normally would never have been exposed to. Maybe she finally says something to him after months and months. Or maybe one of the books leads him to get interested in some new-to-him subculture, and he runs into her at some gathering or something.
This morning on the bus, I had another idea for a twist. She actually does notice him, and she starts deliberately choosing books to read. Maybe she chooses oddball stuff just to play with his mind. Maybe she chooses books that will lead him to some event, in order to get him there since she's too shy to actually say something to him. Or, for a very different kind of story, maybe she chooses the books to lead him somewhere in order to do something badnasty to him. A sacrifice, or something.
This would probably work best told from his perspective, limited third-person narrator, but one that follows him closely. He doesn't realize what's really going on until much later. Maybe he has all sorts of crazy ideas going on in his head, and one of them is actually close to the truth, but he doesn't realize that until later. He's just the kind of person who has all sorts of bizarre fantasies all of the time.