You've Seen It a Million Times; A is reading something, but doesn't want anyone else to know what it is. It could be rather inappropriate for clique rank, like a jock reading a girly magazine. It could be inappropriate to read anywhere outside a bedroom, like a magazine with naked women in it. Heck, maybe it's just a comic book, and for the sake of impressing people, it's prudent to pretend to read (insert well-known intelligent-sounding book here) instead.. or maybe they're supposed to be paying attention in school and just don't want to. Often the hidden book comes from the Porn Stash.