I’m still amazed that the first dozen programs I ever wrote back in 1963 for an IBM 7090 (or 7094) ran first time. (They were trivial programs). I’m also still pissed that I never got to debug the 13th, in FAP (Fortran Assembly Program), which had a minor syntax error – a comma instead of a period, or vice versa. NASA had just launched a weather satellite, which monopolized computer time, leaving zero minutes for high school students.