Hogfather - Skin

Catseye sighed. Certainly there was something odd about Mister Teatime, there was no doubt about that. But there was something weird about all Assassins. And the man paid well. Lots of Assassins used informers and locksmiths. It was against the rules, technically, but standards were going down everywhere, weren’t they? Usually they paid you late and sparsely, as if they were doing the favor. But Teatime was OK. True, after a few minutes talking to him your eyes began to water and you felt you needed to scrub your skin even on the inside, but no one was perfect, were they?

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Hogfather - p36