'Proving you cheated would be like proving the sky is blue - everyone's already seen it.'
'Sometimes the sky is black,' Cuthbert pointed out helpfully. 'At night, for example. And during solar eclipses.'
Cuthbert rocked back on his feet, feeling proud of a clever point well-made.
'And sometimes - when it's stormy - the sky is grey. When it's sunrise-'
'The sky is blue!' the woman cried. 'It's blue, and it's obvious, and you cheated!'
'-it's pink. Or orange,' Cuthbert finished, as if he hadn't heard her and his tone was petulant for entirely different reasons. 'And when it's really cloudy, it's white. Because of the clouds. That's just science,' he finished haughtily.
It was hard, in his experience, to argue with science. It was too scientific.
The woman was staring at him. Probably in science-induced wonder and bafflement, having forgotten why they'd gotten onto this point in the first place, like he had.