Janken is the Japanese name for rock-paper-scissors, a hand game played by children and adults alike, where players chant together before throwing rock, paper or scissors on the final word. The repeated jaka jaka gives this version a bouncy, percussive rhythm that sounds like a quick drumroll before the throw. Short audio clips of Japanese game chants circulate widely in anime edits, gaming videos and meme compilations, where the familiar call instantly signals a playful contest. That shared recognition keeps it useful, even for viewers who do not speak Japanese.