If not worst (https://www.lipstickalley.com/threads/which-cosby-show-intro-is-your-favorite.4690253/), then most baffling (http://nostalgiarush.blogspot.com/2018/09/five-replacement-tv-themes-that-sucked.html):
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Basically, why did an otherwise silly sitcom (http://cinematicsara.blogspot.com/2014/09/i-rank-cosby-show-theme-songs.html) need such a grand opening (https://www.vox.com/2014/9/20/6559471/cosby-show-ranking-credits-titles-theme-song)?