Birdman

When you see a competitor you have to put both hands over your eyes in an eagle formation and thereby 'get' them. You can block such action by doing an OK sign over your right eye. If you 'get someone' they have to put the back of their head on the ground. Then that person is back in the game. You can leave the game, but you can never return. To play you need to get shook in by a current participant.