Premise: McLeod's Daughters is a 1996 Australian television film, it aired on the Nine Network on 11 May 1996, which was Mother's Day. At the time it was the highest rated telemovie and still remains the highest rated telemovie of all time in Australia. The movie was the pilot for the later television series of the same name.
Hypothesis: McLeod's Daughters had high ratings because it aired on Mother's Day.