I fly at a small RAF airfield. At weekends, several flying clubs/organisations use the airfield and things can get quite busy. When ATC go for a lunch break, the Air Training Corps take over the freq and become a A/G station.
A light a/c departs a nearby airfield and calls up on our freq requesting a FIS. It's luchtime, so the A/G service is in use. Que the air cadet CFI:
"G-ABCD, XXXXXXXXXX Radio. ATC Closed blah blah blah. We have 2 aircraft airbourne, both on the ground!"