Danny, damn you, Sir! You've just set me into choking on me damn whisky, don't you know! Bravo for telling a tale that, no doubt rife at the time, I'd not heard before.
Bravo especially for telling it against yourself. A different era, a different RAF, when one could commandeer an aircraft for a mere jape!
"I spell H-O-R-S-E, horse, message ends, over". The best japes were always those that stuck punctiliously to correct procedure.
You have surpassed yourself, Danny. Follow that, as they say in show business.