Mightily Oats: "It's not as simple as that. It's not a black and white issue. There are so many shades of grey."
Granny Weatherwax: "Nope."
Mightily Oats: "Pardon?"
Granny Weatherwax: "There's no greys, only white that's got grubby."
Terry Pratchett, Carpe Jugulum