Regular

“Might I inquire, Vimes, why one of my most conscientious and most decidedly civilian clerks was in a position to do this?”
Vimes shifted uncomfortably. “He was inspecting. Learning all about us, sir.”
He gave Vetinari a look that said: If you take this any further, I will have to lie.
Vetinari returned one that said: I know.
“You yourself are not too badly injured?” the Patrician said aloud.
“Just a few scratches, sir,” said Vimes.
Vetinari gave him a look that said: Broken ribs, I’m certain of it.
Vimes returned one that said: Nothing.

– they’ve known each other for a while |
Terry Pratchett, Thud!