Your speaker possession story reminded me of case we had here in Italy, not too long ago:
radio broadcasts from Radio Maria (a Vatican held radio station) could be heard from most entry phones in the Rome area.
From the following investigations it resulted that the horned one had nothing to do with this oddity. Its reason was more mundane, but not lesser extravagant: in their evangelizing ardor, they had installed overpowered radio transmitters and they were forced by law to downtune them a bit. Dunno if Vatican was condemned to pay a fine for its radio-magnetic bombardment, but I doubt that
