The sound comes from Team Fortress 2, where the Horseless Headless Horsemann appears as a Halloween boss on the Mann Manor map, a headless, pumpkin-carrying spectre wielding a huge axe. First introduced in the game's 2010 Scream Fortress event, he became a seasonal favourite because his appearances turn an ordinary match into a chaotic boss fight. The stun clip is taken from those encounters, and editors have since reused it outside the game for Halloween montages, spooky memes and moments when a powerful character is suddenly stopped in their tracks.