CREATE TABLE table_22971 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" FLOAT, "U.S. viewers  ( millions ) " TEXT)

What's the title of the episode originally aired on September 23, 2008?
SELECT "Title" FROM table_22971 WHERE "Original air date" = 'September 23, 2008'
SELECT "Title" FROM "table_22971" WHERE "Original air date" = 'September 23, 2008'