The phrase belongs to a long-running horror and comedy trope, where a character slowly realises that the threat they are discussing is standing right behind them. As a short online clip, it spread through reaction videos and short-form edits because the line alone sets up a reveal without needing any context. Creators now use it as a quick punchline for jump scares, pranks and surprise entrances, often alongside a scream meme, and it stays popular because the setup is instantly recognisable even to viewers who have never seen the original scene.