As Seinfeld explained on Reddit:

I think the best Seinfeld episode idea I ever contributed was that George pretending to be a marine biologist would find Kramer’s golf ball in the blowhole of the whale. Believe it or not, we were doing both of those stories without seeing any connection that Kramer was gonna hit golf balls at the beach, and George was gonna be pretending to be a marine biologist. And it was in the middle of the week that it suddenly hit me of a way to connect the two stories.

So, I think that’s probably the best joke I ever thought of on the series. But, I love when people say “regift” or “giddyup”, or “yada yadda.” The real and spectacular…I was a very big fan of the show.

But humor is a subjective thing. On Vulture’s ranking of all 169 episodes of Seinfeld, “The Marine Biologist” episode was ranked 61st.

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