Sans is the laid-back skeleton from Toby Fox's 2015 role-playing game Undertale, famous for his puns, shortcuts and dry sense of humour. His distinctive rehehe has become a recognisable funny laugh among fans, shared in edits, streams and memes long after the game's release. Because the chuckle is short, expressive and instantly tied to Sans's personality, creators reuse it as a quick reaction to cheeky moments, ironic twists and smug jokes. Its lasting appeal comes from that character connection rather than any single scene, keeping it popular across Undertale fan content.