The first part is played at the end of movie; the scene when Batman escapes on his Batpod. The middle is during Fox's meeting with Lau in Hong Kong. The end is played when the Joker kills Commissioner Loeb, Judge Surillo, and comes for Harvey Dent at the party saying: 'We made it'! The name comes from the Joker line: "There's a lot of potential for aggressive expansion."