CREATE TABLE table_19625 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Record" TEXT, "Game Site" TEXT, "Attendance" FLOAT)

List all opponents in the September 23, 1984 game?
SELECT "Opponent" FROM table_19625 WHERE "Date" = 'September 23, 1984'
SELECT "Opponent" FROM "table_19625" WHERE "Date" = 'September 23, 1984'