CREATE TABLE table_name_25 (share INTEGER, rank__overall_ VARCHAR(255), timeslot VARCHAR(255), air_date VARCHAR(255))
What is the total share with Timeslot of 8:30 p.m., anAir Date of march 27, 2008, and a Rank greater than 65?
    
SQL: SELECT SUM(share) FROM table_name_25 WHERE timeslot = "8:30 p.m." AND air_date = "march 27, 2008" AND rank__overall_ > 65