Top 5 Best TV Shows

America votes for its favorite television show of all time.
3:00 | 09/18/12

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Transcript for Top 5 Best TV Shows
and finally tonight, we all have a favorite tv show, and in the search for the best, "20/20" partners with "people" magazine and asked america to choose. 1 million votes later, the results are in and, by the way, one result, the all-time favorite tv mom and dad, and the answer to the question? The huxtables of "the cosby show." And sharyn alfonsi tells us about the top five shows. Reporter: There are five favorite tv shows. And we noticed something, each of them, an american family. Some traditional -- ♪ Reporter: Some unexpected. Reporter: Families formed in bars, or on the battlefield. ♪ Reporter: Depicting the korean war -- "m.A.S.H." Was on the air 11 years. Eight years longer than the actual war. Star alan alda pushed for more scenes in the operating room, to give a full portrayal of the heartaches of war. And it did. Capturing our hearts in the process. That last kiss between hawkeye and hot lips, the longest on screen tv kiss ever, 35 second. And there was this kiss, too. One, two, three. Reporter: That moment improvised by sammy davis jr. "All in the family" originally running a warning before the show saying they were trying to shine a light on our frailties and prejudices. Doing it with a punch line. Who whoopdy. Reporter: Some of our tv families almost didn't happen. The "seinfeld" pilot was apparently a disaster. Producer said they needed a girl, so they got one. Get out! Reporter: And she changed everything. Meanie, minie mo. And so did this funny lady. Take a full tablespoon after every meal. She did it in one take. One take that kept our families laughing for decades. Sharyn alfonsi, abc news, new

This transcript has been automatically generated and may not be 100% accurate.

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