Sans is the pun-loving skeleton from Undertale, the 2015 role-playing game created by Toby Fox. His short text-box dialogue, laid-back attitude and dry humour made his reactions easy to clip and reuse online. The heh chuckle spread through fan animations, gameplay edits and meme compilations where a single understated laugh could carry an entire joke. It remains popular because it is instantly recognisable to players yet still works for viewers who only know it as a smug reaction sound.