Had the same whilst lamping in a field, shaggers in a sort of layby in VW Golf, one flash of the lamp directly at them and their gone, I think he was driving with a bare arse.
Another night in complete darkness, no house or town lights nearby, we saw these two lights in the sky coming towards us, we said wtf, it turned out to be Chinese lanterns, probably on their way to set fire to someone's barley.