What is the best example of “it’s a feature, not a bug”?

1 1
This is an example: in a 2013 study, a group of scholars at a German university sifted through the records of five software projects and evaluated thousands of reported coding errors.
They discovered that the bug reports were themselves thoroughly buggy. “Every third bug is not a bug,” they concluded.
The title of their paper was a surprise to no one: “It’s Not a Bug, It’s a Feature.”