 Lawrence Tierney (qv) played Elaines father in one episode. He  was originally going to be a recurring character like Jerrys and  Georges parents. But Tierneys notorious volatility terrified the  cast and crew and they did not want him back. According to the  producers, Tierney took a knife from the set and hid it under his  jacket. When Jerry Seinfeld (qv) asked him about it, Tierney  pulled the knife and proceeded to imitate the famous shower scene  and score from _Psycho (1960)_ (qv).