It's time to rub some skeptics' nose in it, again. This one I first found an article about Antonio Meucci and his "telephony" where he held some wires in his mouth and was able to hear a voice coming through the wires. This lead me to the geophysical electrophony, where things like "aluminum foil, thin wires (like L-rods), pine needles, wire-framed glasses can act as suitable transducers", what they call "natural sources of electromagnetic perception". People have heard meteors, earthquakes, auroras, lightning, etc. Of course locating with L-rods uses the magnetic component and not nearly as powerful.
http://www.bionity.com/en/encycloped...ry_effect.html