What is the original air date of the episode that was directed by David Paymer?
CREATE TABLE "table1_23399481_2" (
  "series_num" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "u_s_viewers_in_millions" text
);
SELECT "original_air_date" FROM "table1_23399481_2" WHERE "directed_by"='David Paymer';