When he didn’t seem to be getting at all pissed we started putting triple and quadruple vodkas in his drinks. Until, after a while, we realized that we were both pissed as farts and Doctor Silk as sober as a magician who had seen right through us, knew exactly what we were up to, and had been swapping the drinks round all night—giving us the spiked ones and supping the alcohol-free ones himself—which was exactly what we deserved.