Joke, scam or the real thing?

This device, which screws in between your TV and cable cord, supposedly blocks the Fox News channel. I can't tell if this is a joke, a scam or the real thing. First of all, if you don't want to watch Fox News, do what the liberals always tell us conservatives to do when some TV show decides to boost its ratings by showing voluminous amounts of female flesh: turn the channel. Also, all modern TVs have had the ability to delete channels from the auto-programmed line-up. In fact, they've had this ability for some time, now. Why do you need to send someone $8.95+S&H for some piece of metal that supposedly does something you can easily do yourself?