Jevil is a secret boss character in Deltarune, the RPG created by Toby Fox. His laugh became memorable with fans because of his chaotic personality, clown-like design and difficult boss fight. Short Jevil audio clips spread through fan edits, meme compilations and game content, where they are used to signal madness, unpredictability or a dramatic turn. It is still popular because even a tiny laugh snippet is instantly recognizable to many Deltarune and Undertale-adjacent viewers.