They’ve got as much sex appeal as a road accident. - Douglas Adams

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.

In fact the only thing that I don't like about Whisky, is that if I take the merest sip of the stuff, it sends a sharp pain from the back of my left eyeball down to the tip of my right elbow, and I begin to walk in a very special way, bumping into people and snarling at the furniture. I have therefore learned to turn my attention to other tipples. Margaritas, I'm very fond of, but they make me buy very stupid things. When ever I've had a few margaritas I always wake up in the morning with a sense of dread as to what I will find downstairs. The worst was a 6ft long pencil and a 2ft wide India rubber that I had shipped over from New York, as a result of one injudicious binge.

A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools.