The lights were off so that his heads could avoid looking at each other because neither of them was currently a particular engaging sight, nor had th… - Douglas Adams

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The lights were off so that his heads could avoid looking at each other because neither of them was currently a particular engaging sight, nor had they been since he had made the error of looking into his soul.
It had indeed been an error.
It had been late one night — of course.
It had been a difficult day — of course.
There had been soulful music playing on the ship's sound system — of course.
And he had, of course, been slightly drunk.
In other words, all the usual conditions that bring on a bout of soul searching had applied, but it had, nevertheless, clearly been an error.