The 'Kermit Did 9/11' meme is a dark humor conspiracy theory based on a background detail in the 2002 film 'It's a Very Merry Muppet Christmas Movie.' In the film, an angel shows Kermit what the world would look like if he had never been born; in that alternate reality, the Twin Towers are still visible in the New York City skyline. This implies that in the Muppet universe where Kermit does exist, his presence somehow led to the events of September 11, 2001. The meme typically uses stills from the movie to jokingly label Kermit as a mastermind or to point out the bizarre continuity error by the filmmakers. It remains a staple of 'cursed' internet facts and Muppet-related humor.