Heard this in the 70s: Apparently some airmen detailed to paint kerb stones pre an AOC's inspection spilt a gallon of said stuff all over the road. Instant solution (to spare the SWO's wrath) was to square off the large spillage, so giving the impression that the marking was there for a reason. Even more apparently, the meaningless spot was annually repainted as a matter of course.
Also heard of a Shack crew found in a discotheque after a forced night landing somewhere in Scotland.
Probably all NAAFI lore told after a few pints of Tartan.