Radio receivers in your head! https://skeptics.stackexchange.com/questions/3638/is-it-possible-to-pick-up-radio-signals-from-dental-fillings https://skeptics.st

Radio receivers in your head! https://skeptics.stackexchange.com/questions/3638/is-it-possible-to-pick-up-radio-signals-from-dental-fillings https://skeptics.stackexchange.com/questions/3638/is-it-poss... Also perhaps most famously: https://www.snopes.com/fact-check/lucille-ball-fillings-spies/ https://www.snopes.com/fact-check/lucille-ball-fillings-spie...