While discussing 3,200 line shell scripts and adding logging thereto, I introduced Stephen to the concept of a bus factor, for approximately the eleventy millionth time (my suggestion was to add the log, ideally a nice big one, to roughly the centre of the developer’s head).
We decided that our relationship had a bus factor of zero. If he were taken out by a bus, there’s no way I’d be able to keep the project going on my own 
Which led to the question of what language he was written in anyway, which took all of about four milliseconds to decide.
Prolog.
He’s all about truth; he’s logical to the point of being really rather annoying sometimes; and trying to understand him will probably result in your brains turning into scrambled eggs.