The Bielefeld Conspiracy is a satirical theory that claims the city of Bielefeld in Germany does not actually exist. It originated in 1993 as a joke on the internet, suggesting that the city is a fabrication created by various organizations to control the population. The theory humorously implies that anyone who claims to have been to Bielefeld is either lying or part of the conspiracy. Despite its absurd premise, the Bielefeld Conspiracy has gained popularity and sparked discussions about the nature of reality and perception. It has become a cultural phenomenon, with various memes and references in popular media, highlighting how easily misinformation can spread in the digital age.