…very early on, back when I was working on DOS 4. We ran into some kind of problem (I’ll be honest and say that I don’t remember what it was).
I was looking into the bug with Gordon Letwin, the architect for DOS 4. I looked at the code and commented “Maybe this is what was happening? But if that were the case, it’d take a one in a million chance for it to happen”.
Gordon’s response was simply: “In our business, one in a million is next Tuesday”.