CREATE TABLE table_23867 ("#" FLOAT, "Date" CLOB, "at/vs." CLOB, "Opponent" CLOB, "Score" CLOB, "Attendance" FLOAT, "Record" CLOB)

Who was the opponent when the attendance was exactly 16642?
SELECT "Opponent" FROM table_23867 WHERE "Attendance" = '16642'
SELECT "Opponent" FROM "table_23867" WHERE "Attendance" = '16642'