Taxi!

Stepson No2 is in the RAF. We went to see him for the day. 'I'll show you round', he said. So self, Mrs F. and he piled into his Y reg Citroen Saxo - the one with the exhaust alternately hitting the road surface and the bottom of the car and drove round the base. After a while the road becomes the perimeter taxi-way. 'Are we OK to be driving on here?' asks Mrs F.  No2 Stepson produces a blue card from his pocket. 'Of course, I've got full runway clearance.'
After a minute we come round a slight curve with trees on, to be faced with a Hercules trundling straight towards us down the taxi-way - not fast, but with a certain amount of purpose. At this point I would have pulled into one of the escape lay-bys and waited. He with the 'full runway clearance card' panics and does a U-turn right across the taxi-way and drives back the way we came with the Hercules chasing the Saxo with self and Mrs F whooping and waving out of the windows.
No2 Stepson sweating slightly swings the Saxo into a maintenance yard.
 'Boy am I going to get a ring-whipping from traffic in a minute.'