The X-Files theme was composed by Mark Snow for the American science-fiction television series The X-Files, which premiered in 1993. Its haunting whistle became pop-culture shorthand for conspiracies and the unexplained, and online creators began pairing it with absurd clips that make no sense, including Brazilian meme pages using the tag não fazendo sentido. The joke works because the music treats nonsense with deadpan gravity, and it remains one of the most recognisable TV melodies on the internet.