This is mostly off-topic but: An author made a book series with a metal based magic system in which aluminum was inert/block magic effects. And there was emoti

This is mostly off-topic but: An author made a book series with a metal based magic system in which aluminum was inert/block magic effects. And there was emotional magic there, so wearing an aluminum foil hat could block covert attempts at influencing you. He was really proud of that :)