Bloopers & Behind The Scenes on Instagram: "Frank Costanza, played brilliantly by Jerry Stiller, became one of the most unforgettable characters in Seinfeld. Introduced as George Costanza’s loud, unpredictable father, Frank brought chaotic energy to every scene he entered—from yelling about Festivus and its iconic “airing of grievances” to his explosive arguments with Estelle. His over-the-top personality contrasted perfectly with the show’s dry observational humor, making nearly every Frank app