Squid Game, the South Korean Netflix series released in 2021, opens with Red Light, Green Light, a childhood playground game turned into a deadly contest in which players must freeze when the signal changes. Clips and sounds from that opening sequence spread quickly on TikTok, YouTube and meme pages, where the red-light moment became shorthand for being caught moving. Its short, instantly recognisable cue still works because viewers already know the stakes without any explanation.