Greebo is a cat in
Terry Pratchett's
Discworld books. He is first introduced in
Wyrd Sisters. He is a foul-tempered one-eyed grey tomcat whose human,
Nanny Ogg, insists against all the evidence that he is a sweet, harmless kitten. In the course of the books, he has killed two
vampires, eating at least one of them in the novel
Witches Abroad:
The bat squirmed under his claw. It seemed to Greebo's small cat brain that it was trying to change its shape, and he wasn't having any of that from a mouse with wings on.
In
Lords and Ladies, Greebo's overall attitude is best described in an allusion to Schrödinger's cat:
Greebo had spent an irritating two minutes in that box. Technically, a cat locked in a box may be alive or it may be dead. You never know until you look. In fact, the mere act of opening the box will determine the state of the cat, although in this case there were three determinate states the cat could be in: these being Alive, Dead, and Bloody Furious.
Shawn dived sideways as Greebo went off like a Claymore mine.
"Don't worry about him," said Magrat dreamily, as the elf flailed at the maddened cat. "He's just a big softy."
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