In case you need to send to a private in 1.9.2:

unsafe_receiver.rb

module UnsafeReceiver
  def send! meth, *args
    unless self.respond_to? meth
      self.class.send :public, meth
      retval = method(meth).call(*args)
      self.class.send :private, meth
      return retval
    end
    send meth, *args
  end
end