The naturalists group were sat around a table in a room above the town library. There were seven women 'of a certain age'.
"I'm quite excited," said Joan. "We need some young blood in our little group," added Alice.
There was a knock on the door. "Come in!" said Dorothy.
A man in his twenties entered, wearing an overcoat that reached to his ankles. "Take your coat off," said Miriam.
He did, and he was stark naked. "What the hell are you playing at, young man?"
"You said join out naturists group," he replied. "I said 'naturalists', you cloth-eared fool!"