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Seinfeld ran for nine seasons between 1989 and 1998 before bowing out with its two-part finale.
While that last episode still splits fans it drew an audience of over 76 million viewers, so it's no surprise that NBC wanted more of the show.
It's said that they were offering in the region of $5 million an episode for one more season.
With the seven previous seasons clocking in at over 20 episodes each, if a final run had the same length you're talking about over $100 million the table, but lead actor Jerry Seinfeld, who co-created and wrote much of the show with Larry David, doesn't regret turning that down.
"No. It was the perfect moment, and the proof that it was the right moment is the number of questions you're still asking me about it," he told the New York Times when asked if he ever second-guessed that decision.
"The most important word in art is 'proportion'. How much? How long is this joke going to be? How many words? How many minutes?
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"And getting that right is what makes it art or what makes it mediocre."
While there haven't been any new episodes since that 1998 finale, the four lead actors (Seinfeld, Julia Louis-Dreyfus, Michael Richards and Jason Alexander) plus Larry David did have a roundtable reunion in 2007.
They also had an on-screen reunion in season seven of Larry David's Curb Your Enthusiasm, with all four leads playing themselves, and later their characters in the fiction-within-fiction read-through for a Seinfeld special.
Jerry Seinfeld, Jason Alexander and Wayne Knight reprised their characters one final time for a Comedians in Cars Getting Coffee Super Bowl promo in 2014, though Jerry has since teased that another reunion is "possible".
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