M*A*S*H

In the "I did not know that" column:

"“Goodbye, Farewell and Amen” was the final episode of M*A*S*H. The episode aired on February 28, 1983 and was 2½ hours long. It was viewed by nearly 106 million Americans (77% of viewership that night) which established it as the most watched episode in United States television history, a record which still stands." Source.

A 77 share. Nice.