Sans is the laid-back skeleton from Toby Fox's Undertale, released in 2015, and like other characters in the game he speaks through short, character-specific text blips instead of recorded dialogue. His low, muffled sound became closely linked to his personality, especially his jokes, puns and calm warnings during the game's story. As Undertale grew into a lasting online fandom, the blip spread beyond the game into fan animations, memes, reaction videos and short edits, where a single sound is enough to signal Sans is speaking. It remains popular because it is instantly recognisable to players.