Veteran web users will remember the elaborate hoax that was YouTuber Lonelygirl15, an actress who fooled much of the YouTube community as a girl whose family was in a crazy cult.

And who hasn’t learned about how much of America truly believed Martians were attacking when War Of The Worlds was aired on the radio back in the early days of the 20th century.   

In his latest video, John Green returns to Mental Floss Video to cover 47 other famous hoaxes that fooled the world.