Found this at James Randi’s website:
I would like to tell the fellow who found a device which enabled him to speak to the dead, that he’s wasting his time with the device. No device is necessary — all a person has to do is to just speak out loud to the dead. The trick is getting them to reply.
Kind of reminds me of the story of the gravedigger who lost track of time and found it was the end of the day and he had dug the grave so deep he could not get out. His co-workers had gone home so he settled down in a corner and went to sleep. A man who cut through the graveyard each night on his way home from work, fell into the new grave. He tried desperately to get out a few times until he heard the voice of the awakened gravedigger, off in a corner: “You can’t get out of here.” Well, he did!