CREATE TABLE table_168 ("#" FLOAT, "Episode" TEXT, "Air Date" TEXT, "Timeslot  ( EST ) " TEXT, "Rating" TEXT, "Share" TEXT, "18\\u201349 Rating" TEXT, "Viewers  ( millions ) " TEXT, "Rank" TEXT)

What was the # for the episode 'the birthday present'?
SELECT MAX("#") FROM table_168 WHERE "Episode" = 'The Birthday Present'
SELECT MAX("#") FROM "table_168" WHERE "Episode" = 'The Birthday Present'