Early Frank Constanza

I saw an old 70s show called Rhoda and Jerry Stiller(hope I got the name correct) was on it.I always thought that his charachter was so crazy because the writers/producers wanted it that way,but on this show he was just like Frank Constanza.He was so [address] acted just like Frank,the talk the mannerisms,everything.Seeing that has just increased my love for Stiller so much,he really is a great asset to the show.