Guards Guards - Impossible

The clouds were clustered thickly over Ankh-Morpork. Above them, the slow golden sunlight of the Disc-world unrolled.

The dragon sparkled in the dawn as it trod the air joyously, doing impossible turns and rolls for the sheer delight of it. Then it remembered the business of the day.

They'd had the presumption to summon it ...

***

Guards Guards - p204