From the ArcaMax Publishing, Trivia Newsletter:
http://www.arcamax.com/news/trivia/s-227894-177939
The children's game Rock, Scissors, Paper is popular in Japan also. Called "Janken", the game is also played by some children using their feet. Closed feet equal stone (gu). Spread legs equal paper (pa). One foot behind the other equals scissors (choki).
This news arrived on: 08/24/2007