Cuarto Milenio is a long running Spanish television programme about mystery, the paranormal and unexplained phenomena, first broadcast in 2005 and presented by Iker Jimenez. Its serious treatment of strange cases made its name instantly recognisable in Spain, and short clips referencing it circulate on soundboards as a shorthand for anything eerie or suspicious. This Eladio Sound System version has spread as a meme audio used out of context, where the television reference gives everyday moments a mock investigative tone that Spanish speaking audiences immediately understand.