At a Dorset airstation:
"Testing the tannoy from the main gate. 1,2,3,4,5,5,4,3,2,1 test complete"
This carried on for a fair while the lad was getting a bit tired of the repetition so tried to vary it
"Testing the tannoy from the main gate A,B,C,D,E,E, D, errrr 5,4,3,2,1 test complete"
The entire airstation collapsed with laughter.