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