The sound comes from gameplay of Who's At The Door, a horror game in which the player must check who is knocking while strange visitors and threats build tension around the house. In this moment, Vicksy is startled when a monster smashes through a mirror, and the resulting scream has circulated in horror clips and reaction edits as a compact scream meme. Because it needs no context to land, creators keep reusing it for fake scares, sudden reveals and exaggerated reactions, long after the original playthrough.