Frank Costanza’s Festivus holiday has become one of the most iconic aspects of Seinfeld’s sitcom, though it’s unbelievably based on the real-life holiday from a Seinfeld writer’s childhood. The writers of Seinfeld often agree that the funniest bits from the show come from real-life occurrences, such as the iconic season 7 “The Rye” episode or Larry David’s “Big Salad” experience.
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