When "the 37-year itch" is the title what is the lowest series number?
CREATE TABLE "table1_25649467_2" (
  "series_num" real,
  "season_num" real,
  "title" text,
  "director" text,
  "writer_s" text,
  "original_air_date" text
);
SELECT MIN("series_num") FROM "table1_25649467_2" WHERE "title"='\"The 37-Year Itch\"';