Most armies are in fact run by their sergeants - the officers are there just to give things a bit of tone and prevent warfare becoming a mere lower-class brawl.

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.

All the higher life forms scythed away, just like that. [ . . . ] Nothing but dust and fundamentalists.

We're dealing here," said Vimes, "With a twisted mind." "Oh, no! You think so?" "Yes." "But... no... you can't be right. Because Nobby was with us all the time." "Not Nobby," said Vimes testily. "Whatever he might do to a dragon, I doubt if he'd make it explode. There's stranger people in this world than Corporal Nobbs, my lad." Carrot's expression slid into a rictus of intrigued horror. "Gosh," he said.

The calendar of the Theocracy of Muntab counts down, not up. No-one knows why, but it might not be a good idea to hang around and find out.

He found that he had this sudden desperate longing for the fuming, smoky streets of Ankh-Morpork, which was always at its best in the spring, when the gummy sheen on the turbid waters of the Ankh River had a special iridescence and the eaves were full of birdsong, or at least birds coughing rhythmically

You were safe on a troll. Anyone wanting to mug a troll would have to use a building on a stick.