test

attempt_5000.rb

module Test
  class << self
    def list
      @list ||= []
    end

    def add(id, item)
      list << { :id => id, :item => item }  
    end
  end

  def each_bleh(&block)
    Test.list.each &block
  end
end

class Blah
  include Test

  def initialize
    each_bleh { |item| puts item.to_yaml }
  end  
end

class Bleh
  include Test

  def initialize
    each_bleh { |item| puts item.to_yaml }
  end
end

Test.add :frog, "tree"

Blah.new
Bleh.new