Nope, the Dresden novels. That's a line from Butters, a kind of sidekick to Harry Dresden now and then and definitely a friend. Butters loves Polka, and Harry rallies him in one book with a great speech about how they're not going to die, because "most of all Butters, Tomorrow is Okoberfest, and Polka will never die!" //Rallied, Butters takes that as his battle cry! "Polka will never die"