SCHEMA:
CREATE TABLE table_name_25 (share INTEGER, rank__overall_ VARCHAR, timeslot VARCHAR, air_date VARCHAR)
USER:
What is the total share with Timeslot of 8:30 p.m., anAir Date of march 27, 2008, and a Rank greater than 65?

QUERY:
SELECT SUM(share) FROM table_name_25 WHERE timeslot = "8:30 p.m." AND air_date = "march 27, 2008" AND rank__overall_ > 65