The Upside Down is the parallel dimension at the center of Stranger Things, the Netflix series that debuted in 2016. Sounds and music linked to it became popular in edits because they instantly signal dread, mystery and supernatural danger. Online, creators use short Upside Down audio clips for meme reveals, horror punchlines and dramatic transitions when a video suddenly becomes darker or more cursed. Its staying power comes from how recognizable the show’s mood is, even in a very short piece of audio.