Contrary to popular belief and hope, people don't usually come running when they hear a scream. That's not how humans work. Humans look at other humans and say, 'Did you hear a scream?' because the first scream might have been you screaming inside your head, or a horse backfiring.

It was a backwards memory of an event in his future so terrifying that it had generated harmonics of fear all the way along his lifeline.

Wizards don't believe in gods in the same way that most people don't find it necessary to believe in, say, tables. They know they're there, they know they're there for a purpose, they'd probably agree that they have a place in a well-organised universe, but they wouldn't see the point of believing, of going around saying "O great table, without whom we are as naught." Anyway, either the gods are there whether you believe in them or not, or exist only as a function of the belief, so either way you might as well ignore the whole business and, as it were, eat off your knees.

I try to make computers say things like You have 60 seconds to achieve safe distance.

The thing about secrets is that they are usually best kept by just one person. That was the special thing about secrets. Some people seemed to think that the best way to keep a secret was to tell as many people as possible; what could possibly go wrong for a secret when there were so many people defending it?

Divers alarums and excursions', she read, uncertainly. 'That means lots of terrible happenings, said Magrat. 'You always put that in plays.' Alarums and what?', said Nanny Ogg, who hadn't been listening. Excursions', said Magrat patienly. Oh.' Nanny Ogg brightened a bit. 'The seaside would be nice,' she said. Oh do shut up, Gytha,' said Granny Weatherwax. 'They're not for you. They're only for divers, like it says. Probably so they can recover from all them alarums.

The Battle of Koom Valley is the only one known to history where both sides ambushed each other.