My alltime favorite error message came from IBM's PL/I (F) compiler: “Compiler is unable to abort”. This appeared repeatedly, double-spaced, on every page of a

My alltime favorite error message came from IBM's PL/I (F) compiler: “Compiler is unable to abort”. This appeared repeatedly, double-spaced, on every page of a box of paper. It was accompanied by a blue “You have been very naughty” sheet from the Computer Centre. I had to point out that it was their compiler that was doing it. To this day, the notion that a program would be able to print out that message, but can't exit, still boggles my mind.