Jevil is the secret jester boss from Deltarune Chapter 1, released in 2018, who is locked away for seeing the world as a game and embracing chaos. His repeated cry of chaos became his signature line, quoted by fans and clipped for edits long after players beat his notoriously difficult fight. The sound spread through Deltarune fan videos, meme compilations and soundboards, where its manic tone made it shorthand for anything unpredictable. It remains popular because it instantly signals that a scene has tipped from normal into completely unhinged territory.