CREATE TABLE table_28519 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT, "U.S. viewers  ( million ) " TEXT)

how many u.s. viewers (million) have seen a production written by chris sheridan & danny smith
SELECT COUNT("U.S. viewers (million)") FROM table_28519 WHERE "Written by" = 'Chris Sheridan & Danny Smith'
SELECT COUNT("U.S. viewers (million)") FROM "table_28519" WHERE "Written by" = 'Chris Sheridan & Danny Smith'