The laugh comes from the Roaring Knight, the masked antagonist of Deltarune, and is heard in Chapters 3 and 4 of Toby Fox's episodic role-playing game. The Knight appears suddenly, speaks little and carries an air of menace, so the laugh quickly became one of the character's most recognisable traits. Fans clipped it from gameplay, shared it in short videos and used it in edits, reaction clips and theory videos, where it signals danger, a twist or a villain's entrance. Its short length and unsettling tone keep it useful for creators.