gistfile1.rb

module Rack
  class Roll
    
    def initialize(app)
      @app = app
    end
    
    def call(env)
      if roll?
        return [302, {'Location' => 'http://www.youtube.com/watch?v=oHg5SJYRHA0'}, ["You've been rick rolled"]]
      else
        return [404, {}, ['']]
      end
    end
    
    private
    
      def roll?
        (rand(10) == 4)
      end
    
  end
end