Cunning

My lodger has just walked past my open French doors (leading on to the garden).

'Hallo,' he remarked, looking in. 'I never think of them as doors.'

'I think you'll find they serve the purpose of doors, as they open and you can walk through them,' replied I, looking up from reading about Baldrick in Wikipedia.

He did chuckle.

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I posted this on a saily forum. They are rude buggers.