gistfile1.rb

ruby-1.9.3-preview1 :070 > a = [Array, String, Class.new(String)]
 => [Array, String, #<Class:0x007fcab38332b0>] 
ruby-1.9.3-preview1 :071 > a.shuffle
 => [#<Class:0x007fcab38332b0>, String, Array] 
ruby-1.9.3-preview1 :072 > a.shuffle(random: Random.new(1))
 => [Array, #<Class:0x007fcab38332b0>, String] 
ruby-1.9.3-preview1 :073 > a.shuffle(random: Random.new(1))
 => [Array, #<Class:0x007fcab38332b0>, String] 
ruby-1.9.3-preview1 :074 > a.shuffle(random: Random.new(2))
 => [#<Class:0x007fcab38332b0>, Array, String] 
ruby-1.9.3-preview1 :075 > a.shuffle(random: Random.new(2))
 => [#<Class:0x007fcab38332b0>, Array, String]