According to Larry David, Steinbrenner himself was actually meant to appear playing himself in one episode of Seinfeld (The Finale, IIRC). They shot his scenes,

According to Larry David, Steinbrenner himself was actually meant to appear playing himself in one episode of Seinfeld (The Finale, IIRC). They shot his scenes, but found in editing that his acting was so lousy that they had no choice but to edit him out. When Larry David called Steinbrenner to tell him that they could not use the scenes they had shot with him, the conversation went something like this (from memory): LD: Mr Steinbrenner, I'm afraid I have some bad news. GS: It's ok, I'm a big boy, I can take it.