Mostly humor, but also a suggestion. Why? Because if it was real code I'd want the 'why' to be as specific as possible. It doesn't have to be a novel, but it also shouldn't be left open for interpretation.
Too many times have I gotten some ancient piece of code and cursed the author (sometimes this is even myself) for either not documenting it well or it had a bug or whatnot. "OMG, what were they thinking when they wrote this code?!" I never want to be in the position where someone is cursing me.