There are people in the world that think nuclear bombs are impossible and that every explosion has been faked for propaganda including Hiroshima and Nagasaki.
In 1910 a group of students from Cambridge darkened their skin, donned turbans, and presented themselves to the British Royal Navy as ambassadors from Abyssinia. They conducted an inspection of the fleet, bestowed honors upon British officers, and spoke in a Latin/Greek gibberish.
In 1991 a fake Russian tv program on Leningrad tv convinced many citizens that Lenin consumed a lot of psychedelic mushrooms, eventually even becoming a mushroom himself. The Leningrad communist party had to declare that”Lenin could not have been a mushroom” because “a mammal can not be a plant”.
Animal Planet aired a fake documentary about the existence of mermaids that convinced thousand of viewers. Twice.
In 1967 a magazine published a fake story about extracting hallucinogenic chemicals from bananas to raise moral questions about banning drugs. People didn’t realize it was a hoax and began smoking banana peels to try to get high.
For about a decade in the US, a man called fast food restaurants impersonating a police officer and successfully manipulated managers into strip searching innocent employees. There were over 70 reported occurrences in 30 states until his arrest in 2004.