Sans is the laid-back skeleton from Undertale, the role-playing game released in 2015, and like other characters in the game he does not speak with recorded lines. Instead, each line of dialogue is accompanied by a short, low-pitched blip, giving him a distinct sound that players hear throughout his many scenes. Fans clipped those blips for gameplay videos, memes and short edits, where a single chirp could stand in for Sans himself. It remains popular because it is instantly recognisable to Undertale fans and works as a quick joke cue without needing a full quote.