As Big Bang Theory fans know well, it happens to all of us: Our favorite TV show comes to an end. With the rise of streaming services like Netflix and Hulu, there are so many entertaining options in TV shows and movies, but it feels impossible to replace a favorite series. "It was a monster hit for network television — for television in general," Kelly Kahl of CBS Entertainment said. As such a "monster hit," we have to wonder why in the world the world the series ended. Now we finally know why.