I had one of these nutters living over the road from me. He showed me a plastic box with a loudspeaker on it, when you switched it on it made a hissing noise, he claimed that he could hear dead people speaking behind the hissing. I told him that it was simply a radio tuned into a frequency range where there were no transmissions and he was imaging the voices .. he said that I was deafened to the voices by the devil.