Greebo

“For instance, on the planet Earth, man had always assumed that he was more intelligent than dolphins because he had achieved so much—the wheel, New York, wars and so on—whilst all the dolphins had ever done was muck about in the water having a good time. But conversely, the dolphins had always believed that they were far more intelligent than man—for precisely the same reasons.”
― Douglas Adams, The Hitchhiker’s Guide to the Galaxy

“Give a man a fire and he's warm for a day, but set fire to him and he's warm for the rest of his life.”
― Terry Pratchett, Jingo

“Five exclamation marks, the sure sign of an insane mind.”
― Terry Pratchett, Reaper Man

“If cats looked like frogs we'd realize what nasty, cruel little bastards they are. Style. That's what people remember.”
― Terry Pratchett, Lords and Ladies