Polybius is a legendary urban legend originating in the early 2000s, claiming that a mysterious arcade cabinet appeared in Portland, Oregon, in 1981. According to the myth, the game had psychoactive effects, causing seizures, amnesia, and insomnia, while 'men in black' supposedly collected data from the machines. While widely debunked as an internet hoax, the Polybius cabinet has become a staple of internet creepypasta and retro-gaming culture. It is frequently used in memes to symbolize government conspiracies, dangerous nostalgia, or the psychological impact of addictive video games.