module Fuller
  module ClassMethods
    def classy
      puts "a mixed in class method"
    end
  end

  module InstanceMethods
    def insticky
      puts "a mixed in instance method"
    end
  end

  module CommonMethods
    def everywhere
      puts "a mixed in method for both class and instance"
    end
  end

  def self.included(klass)
    klass.extend(ClassMethods)
    klass.extend(CommonMethods)
    klass.send(:include, CommonMethods)
    klass.send(:include, InstanceMethods)
  end
end

class MyKlass
  include Fuller
end

MyKlass.classy          #=> "a mixed in class method"
MyKlass.new.insticky    #=> "a mixed in instance method"
MyKlass.everywhere      #=> "a mixed in method for both class and instance"
MyKlass.new.everywhere  #=> "a mixed in method for both class and instance"