CREATE TABLE table_73485 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production code" CLOB, "U.S. viewers  ( millions ) " CLOB)

Name the original air date for ' don't look a smith horse in the mouth
SELECT "Original air date" FROM table_73485 WHERE "Title" = ' Don''t Look a Smith Horse in the Mouth '
SELECT "Original air date" FROM "table_73485" WHERE "Title" = ' Don''t Look a Smith Horse in the Mouth '