Red Spotted Knickers
UNKNOWN DANCERS AT AN UNNOWN DANCE, APRIL 1958 (1607B42)
I had to look at this photograph for some time before I realised what was going on. And then I remembered "spot prizes": dances back in those days of mock-innocence when the bandleader would interrupt the foxtrot to announce some curious object and the first person to rush up with it got a spot prize. Here he has obviously just called out something like "a ten shilling note" or "a small tooth comb". I seem to remember being at a dance once where they called out "a pair of red knickers". But perhaps that is merely the sad dreams of an old man.