Being the parents of two young girls, J and I have very little time to watch TV. So when we do get the time to catch up on our favorite shows, it is not uncommon for one of us to ask the other, "Why do we continue to watch this show again?" Let me explain. Say that you started watching a television series. Say that you fell in love with its storyline, its characters, and the way that it makes you feel. But after a few seasons, that show starts to lose its luster. The jokes become repetitive. The characters become clichéd and annoying. And worse still, the story begins to suffer. In other words, the show has hit its prime long ago, and it's...