There is this thing that's called a remote and somewhere on it is a button that reads "On/Off" or "Power." Press that button.
Don't worry if you can't find the remote there is a similar button somewhere directly on your TV - press it.
In the alternative, keep watching it night and day. Eventually desensitization will set in and the bits and chunks that got you all excited before, will start to look like bizzare lumps and sacks of flesh. When that happens you might as well watch a cooking show.
Of course if thine eye offends thee, thee can always pluck it out.
With caller ID now it's tough to make prank calls isn't it Davy? Somehow these prank posts just aren't as much fun.