You will, no doubt, be familiar with the 1995 footage of a supposed alien autopsy. Since its yikes-inducing TV debut, the jittery black-and-white film is estimated to have been viewed by a billion people. Still, for better or worse, here it is again: a scrum of faceless hazmat suits hover over the corpse of a pot-bellied humanoid. Its forehead? Bulbous. Its expression? Pensioner outraged at price of bark chippings in local branch of Wickes.