White Noise
Some people believe that the dead can speak to us and their voices and images are sometimes captured in pictures and recordings.
There’s even an organization dedicated to the study of the phenomena. And whether you believe it’s possible or not, I’ll bet that you spend a bit more time than expected if you visit their site.
I always try to keep an open mind to things and love the idea that it may be true. But true or not, the concept does make a great springboard for a movie.