Re: thermonuclear FORTRAN
Not me, but a colleague whose code I was responsible for testing. He inherited the job of porting some network driver code from one of our devices to another. This is embedded code, there is no emulator, so the only way to debug it is by using breakpoints and a serial terminal debugger.
The code is 10,000 lines of assembler written by a guy who had long since left. It contains one comment. That comment is "SPONG!".
He got it working. Bloody legend that bloke.