I have read (in the 1960s) that it was possible/theorized that fillings in teeth could act like the germanium diode in a crystal radio and if the individual were in an RF field it might cause a sensation or feeling of the demodulated signal. Seems unlikely but might be possible.
It used to happen with amalgam fillings. Folks thought they were going crazy.
Here's (almost!) a corollary: When I was a kid, my parents (OK, my
father, first and foremost) had a hifi system that used a (somewhat mismatched) pair of high-sensitivity EV "Wolverine" fullrange (twincone) drivers in large vented enclosures. I remember
vividly hearing one of them (an LS-15 driver; sensitivity in the mid-high 90s dB per watt @ 1 meter) playing a local AM radio station (WFBR) faintly but unmistakably, with everything in the system switched off. WFBR's transmitters were just a few miles from our house. My father's theory was that the (long) speaker wire on the LS-15 was doin' the work of an antenna, and something (maybe a defect in the voicecoil, or maybe just the screw-threaded junction 'twixt wire & driver) was acting as a detector.
Irrespective of the root cause, that speaker could play WFBR
sans electricity -- akin to a "foxhole radio" (look it up)
EDIT: These are LS-15 'fullrange' drivers, FWIW.
P1030332 by
Mark Hardy, on Flickr
P1030335 by
Mark Hardy, on Flickr