You can get the tune of this 'flourish' if you sing it, as we used to in my long-since schooldays, as -

'Where was the engine driver when the boiler blew? —

They found his BOLLOCKS
A thousand miles away   
Floating way down in Hudson Bay.
Floating, they found them floating
And so we had them for dinner today.'

Not a version that makes much sense; but doesn't appear to have been quoted on this thread before, so perhaps worth record. & it does start with the 'flourish'.