I might have posted these elsewhere, but here goes anyway:
A senior cadet colleague with a very dry wit encountered a junior cadet grinning away.
'Why are you looking so happy, XXX?'
'Because the sun's shining, sir.'
'You stupid idiot, the sun's always shining. It's just sometimes you can't see it.'
Same senior cadet walking with SUO, who comments:
'Oh, it's starting to rain.'
'It's alright, sir, I'll have it switched off.'