An elderly QM, pissed on port in the mess once told me a similar story of MP dogmatism. It seems the said QM, when a young Lcpl and on exercise, was put on guard duty near the military part of Brookwood cemetary one night during the small hours. After a while the young QM to be heard a bit of noise coming from the cemetary and looked over the wall. Hardly believing his eyes he saw a skeleton wrestling with a gravestone and with a heave and a clatter dragged it bodily out of the ground, hoisted it onto his shoulder and made off with it. Whilst the young QM to be was wondering how to phrase his report on the matter, the skeleton came striding by still with the gravestone on his shoulder. Summoning up his courage the young QM to be challenged the skeleton and asked why he was carrying a gravestone on his shoulder.
That c unt on the gate wouldnt let me out without me id card, replied the skeleton striding into the darkness.