public void run() {
   try {
     while (!Thread.interrupted()) {
       // Blocks until next piece of toast is available:
       Toast t = dryQueue.take();
       t.butter();
       print(t);
       butteredQueue.put(t);
     }
   } catch (InterruptedException e) {
     print("Butterer interrupted");
   }
   print("Butterer off");
 }