Access to calling chain associations

Assuming that we have a player model and a game model and that each game
has multiple players as described below.

class Game < ActiveRecord::Base
has_many :players

def some_method
#
# which player called me?
#
end

end

class Player < ActiveRecord::Base
belongs_to :game
end

Is there a way to determine which player called some_method in the game
when called through one of the players and without explicitly adding the
player to the argument list? For example ...

Player.find(id).game.some_method();

nope (at least nothing sensible I can think of). 'Which player called
me' might not even be defined (eg if you do Game.find
(123).some_method.

Fred