Seinfeld Fanatics - ID this episode please

The episode in question had a scene with Jerry and George at the diner.

A Superman discussion was going on where Jerry was using the ketchup bottle to represent the red sun of Krypton, and the mustard bottle was the yellow sun of Earth.

I was in a bar when this was on, and they turned it away. I never saw that scene again, even in reruns, so I must be unlucky.

So anyone know what episode it was?

The Stock Tip, according to the results of this quiz.

The script…