I heard this story from some veterans of days gone by:
One dark moon evening, as a military atc was reading his novel in the tower of his airfield, situated in the middle of the bush, somewhere in Africa, awaiting the return of 2 Impala jets from a night strike.......he was suddenly shook out of his story by the 2 Impala jets returning early and overflying the tower by a few inches without any navigation lights on. As they pitched up to position onto a downwind for the landing the radio sounded: "Guess who?".
The atc stood up from where he fell off his chair, switched off the runway and airfield lights and replied on the radio:"Guess where?".