‘This is going to go the distance?’ ‘Yep. It’s got to. We’ve got to stop this, Ned. This is the only chance. It stops here or not at all. Can you imagine him loose now he’s pally with Snapcase?’ ‘Yes. I can,’ said Ned. ‘Just as well I wasn’t planning anything this evening, eh? But you can tell me one thing, sarge. How do you know all this?’ Vimes hesitated. But at a time like this, what difference did it make? ‘I’m from this city,’ said Vimes. ‘But, oh, there was a hole in time, something like that. You want to know? I travelled here in time, Ned, and that’s the truth.’ Ned Coates looked him up and down. Blood covered Vimes’s armour, and his hands, and half his face, and he was holding a bloody sword in his hand. ‘From how far back?’ he said.

— Night Watch (Discworld, #29; City Watch, #6) by Terry Pratchett (Page 316)