Vimes shook his head and strolled on. “They don’t have trolls in Klatch, do they?” he said.
“Nossir. It’s der heat. Troll brains don’t work in der heat. If I was to go to Klatch,” said Detritus, his knuckles making little bink-bink noises as he dragged them over the cobbles, “I’d be really stoopid.”
“Detritus?”
“Yessir?”
“Never go to Klatch.”
“Nossir.”
– Terry Pratchett, Jingo