An interesting article I found today:
Real Programmers are reluctant to actually edit a program that is close to working. They find it much easier to just patch the binary object code directly, using a wonderful program called SUPERZAP (or its equivalent on non-IBM machines). This works so well that many working programs on IBM systems bear no relation to the original Fortran code. In many cases, the original source code is no longer available. When it comes time to fix a program like this, no manager would even think of sending anything less than a Real Programmer to do the job– no Quiche Eating structured programmer would even know where to start. This is called “job security”.
Funny how many things today we consider to be obscure and to require a master to deal with were considered toys twenty years ago.