tnt_timer.rb

class TNT
  class Timer
    def initialize
      @time_left = 42
    end
    
    def time_left
      @time_left -= 1
    end
  end
  
  def initialize
    @timer = Timer.new  # I don't need TNT::Timer here, because I'm in TNT
  end
  
  def are_we_dead_yet?
    @timer.time_left <= 0
  end
end

tnt = TNT.new
until tnt.are_we_dead_yet?
  puts "Not dead yet!"
end
puts "Now we're dead."