My son I law was doing his greek national service on some island in the Med when hi and is mate were giving the job of guarding some RAF planes that were staying overnight. Personally I wouldn't give him the job of guarding my sandwiches but that's another story. The planes, I don't know what they were, had a pole poking out of the front nose cone. Bored, they thought they would amuse themselves by doing chin ups from said pole. Needless to say it was discovered in the morning how easy it is to ground an RAF jet without firing anything at it. Him and his mate had to do an extra year as punishment. Never been able to verify the story but I know he did an extra year as punishment for something.