Okay, this is driving me crazy. Yesterday, while lunching in the Bear and Swan at Chew Magna, I told gair and gerald a story I dimly remembered hearing - or possibly reading - about a young man in Venice (or maybe some other Italian city) who takes up with a woman he meets one evening, goes back to her place, hops into bed ready to play the votary of Venus, and then realises that he's left the light on. He starts to get out of bed to cross the room to the light switch (or possibly to turn down the oil lamp - I'm not sure how old this story is), but she stops him and says, "Don't worry, I'll do it."
And she reaches out her arm, which grows and grows, and snakes across the floor and up the wall at the far side, and plunges the room into blackness with a .... CLICK.
Anybody else know this story? Where it comes from? And, if it's written, who wrote it?