add retarded mixin examples

groovy/mixins.groovy

@@ -0,0 +1,12 @@
+class MyMixin {
+  void print_me() {
+    print "See me Print\n"
+  }
+}
+
+@Mixin(MyMixin)
+class Donkey {}
+
+donkey = new Donkey()
+print donkey.print_me()
+

ruby/mixins.rb

@@ -0,0 +1,30 @@
+module MyMixin
+  def class_name
+    self.class.to_s
+  end
+end
+
+module Magical
+  def magic
+    puts "Magical: #{rand(100)}"
+  end
+end
+
+class ClassOne
+  include MyMixin
+  include Magical
+end
+
+class ClassTwo
+  include MyMixin
+  include Magical
+end
+
+c1 = ClassOne.new
+puts "c1.class_name:#{c1.class_name}"
+c1.magic
+
+c2 = ClassTwo.new
+puts "c2.class_name: #{c2.class_name}"
+c2.magic
+