CREATE TABLE table_36149 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Record" TEXT, "Game Site" TEXT, "Attendance" TEXT)

Who did the Colts play against on September 25, 1966?
SELECT "Opponent" FROM table_36149 WHERE "Date" = 'september 25, 1966'
SELECT "Opponent" FROM "table_36149" WHERE "Date" = 'september 25, 1966'