The sound comes from Netflix's Squid Game, first released in 2021, where a giant motion-sensing doll oversees the opening Red Light, Green Light game. Its calm, nursery-rhyme delivery quickly became one of the show's most recognisable moments, and clips of the doll spread across TikTok, YouTube and meme pages as the series became a global hit. Creators still reuse it because it instantly signals a high-stakes game, a strict rule and the threat of elimination without needing any explanation.