5. The Cosby Show
Episode: "The Day The Spores Landed" By its sixth season, the much-loved 80's staple The Cosby Show's freshness had worn off, and it was reduced to making ridiculous gimmick episodes like this, where Dr. Huxtable eats a greasy sausage sandwich, with the resulting indigestion causing a B-movie inspired nightmare about alien spores landing on Earth that somehow turn all men pregnant, which is as ridiculous as it sounds and fairly painful to watch (with the most revolting delivery room scene in television history.) The Cosby Show never wandered so far away from its family-friendly roots again.