Sans is a skeleton character from Undertale, the role playing game released by Toby Fox in 2015. In the game, characters do not have full voice acting, so each speaks with a short looping sound, and Sans's low blip became one of the most recognisable. As Undertale fan videos, remixes and memes spread on YouTube and social media, creators isolated the sound to caption jokes and imitate his speech. It remains popular because a single blip instantly evokes his laid back personality and the game's mix of comedy and menace.