How many millions of people in the US saw the episode titled "Ball of Trash"?
CREATE TABLE "table1_23403578_3" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "prod_code" text,
  "u_s_viewers_in_millions" text
);
SELECT "u_s_viewers_in_millions" FROM "table1_23403578_3" WHERE "title"='\"Ball of Trash\"';