I never seem to get tired of Ralph & Ed & Trixie & Alice. They are like comfort food. No matter how down I'm feeling, I can tune in to my favorite "classic 39" episode and find myself laughing out of my socks.
Whether its the chef of the future, Ralph and Ed going over to charm the pretty wife of superior, or thinking that they've been left a fortune by an elderly lady ... I can never get enough; laughing at the same jokes on the 2,000th viewing of any given episode. Seinfield was funny, but this show was hilarious.