I think I know what you mean... Happy Days had a long-term and deep effect on America. It became a part of the society! It was like it stopped being a show, and started being a government service... something that would just always be there.
I think that The Cosby Show, Cheers, and Friends all fall into that same category of shows that people would watch simply because it WAS that show. For a sit-com to hit that level of social acceptance is a rare and beautiful thing.
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