Greebo

“Two possibilities exist: either we are alone in the Universe or we are not. Both are equally terrifying.”
― Arthur C. Clarke

“Some humans would do anything to see if it was possible to do it. If you put a large switch in some cave somewhere, with a sign on it saying 'End-of-the-World Switch. PLEASE DO NOT TOUCH', the paint wouldn't even have time to dry.”
― Terry Pratchett, Thief of Time

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

“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