One of the greatest 1st April's jokes I've ever seen. "The Commentator uses revolutionary real-time language processing to actually grok your code and add the necessary comments on the fly." One of the example that Commentator may do :)

//okey dokey, lets sum the elements of a
  int sum = 0; // the sum of all fears
  for (int i= 0; i < a.length; i++) {
      sum += a[i]; // all your a[i] are belong to us
  }