“Yeah,’ said Zaphod, stepping into it, ‘what else do you do besides talk?’ ‘I go up,’ said the elevator, ‘or down.’ ‘Good,’ said Zaphod. ‘We’re going up.’ ‘Or down,’ the elevator reminded him. ‘Yeah, OK, up please.’ There was a moment of silence. ‘Down’s very nice,’ suggested the elevator hopefully. ‘Oh yeah?’ ‘Super.’ ‘Good,’ said Zaphod. ‘Now will you take us up?’ ‘May I ask you,’ enquired the elevator in its sweetest, most reasonable voice, ‘if you’ve considered all the possibilities that down might offer you?”
―
Douglas Adams,
The Restaurant at the End of the Universe