A family of brilliant children are on a weekly radio quiz show. The oldest, Seymour, tells his sister Franny to polish her shoes beforehand. She asks why since no one can see their shoes. He tells her to polish her shoes "for the fat lady" sitting on her porch listening to their show.
Later Franny asks another brother, Zooey, who the "fat lady" is. He answers, "There isn't anyone out there who isn't Seymour's Fat Lady. There isn't anyone anywhere who isn't Seymour's Fat Lady. And don't you know--listen to me now--don't you know who that Fat Lady really is? It's Christ Himself."
(from J.D. Salinger's Zooey)