Ok - Here is the best part. You are going to add some words that will appear in your movie a different time intervals. These words will fade in and then fade away like the TV is possessed. For example you could put "I am coming to get you!" at different intervals throught the movie. Or you could develop a scary kind of story that appears over time. For example, after the first "I m coming to get you," you could put "I am almost there." and then maybe "Not Long Now" and then Maybe at the end of the movie put "I am Here" and then turn all of the lights off.
You can easily do this movie editing software like Nero or Studio Plus.
Check back soon for a video presentation of how to do this effect.