So the ailens can't read your mind, didn't you watch Signs?
A tin-foil hat, also tinfoil hat, is a general term for a piece of headgear made from one or more sheets of tin foil, aluminium foil, or other similar material. Some people wear the hats in the belief that they act to shield the brain from such influences as electromagnetic fields, or against mind control and/or mind reading. Hats made from foil are very rarely used, since the injuries they might guard against are highly speculative, and their effectiveness in preventing such harm would be dubious even if the danger were plausible. Instead, the concept has become a popular stereotype and term of derision; in Internet culture, the phrase (sometimes as the abbreviation "TFH") serves as a byword for paranoia.
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