Tsubasacon 2013

Ninja is a game commonly played at Anime conventions that generally has
between 4-20 players, but can be played with any number above 2. Players
start in a circle, and a countdown begins. After the countdown, players
jump into a ninja pose, and a round leader is picked to start. Players
then take turns making motions in an attempt to tag the hand(s) of any
other player while not getting their own hands tagged. Once you are
tagged, you are out, and the game continues until the last person remains.
Average game time is between 3 to 8 minutes, depending on number of
players.

Dangers of the game:
Players are STRONGLY urged to remove any jewelry on their hands and feet,
as well as to remove any large or otherwise cumbersome props.