session_hijacker.rb

class ApplicationController < ActionController::Base  

  def session
    @session ||= SessionHijacker.new(super, request)
  end

  def session=(session)
    "------ SESSION WAS REPLACED!!!"
    super(session)
  end

  class SessionHijacker

    def initialize(session, request)
      puts colorize, 34 do
        [
          "\n\nSession Initialized!",
          "   session_id: #{request.session_options[:id].inspect}\n\n"
        ].join("\n")
      end
      @session = session
    end
    
    def __colorize(color_code, &block)
      "\e[#{color_code}m" + block.call + "\e[0m"
    end

    def method_missing(m, *args, &block)
      return_val = @session.send(m, *args, &block)
      puts __colorize 35 do
        [
          "Session Called ",
          "   #{m}(#{args.map(&:inspect).join(', ')})",
          "   Returned: #{return_val.inspect}" 
        ].join("\n") + "\n\n"
      end
      return_val
    end
    
  end
end