This was no laughing matter.

Julia Louis-Dreyfus recalled a heated spat taking place between “Seinfeld” co-creator Larry David and executives from Castle Rock Entertainment production company while filming a Season 2 episode of the sitcom.

In the ninth episode that season, titled “The Deal,” Louis-Dreyfus’ character Elaine Benes and her best friend, Jerry Seinfeld, sleep together.

However, the duo pledges to remain strictly friends with benefits.

“There was a big fat argument on set about that because Jerry and Elaine sleep together in that episode and they sort of make a deal about it,” Louis-Dreyfus revealed on Thursday’s episode of “Awards Chatter” podcast, per the Hollywood Reporter.

The actress said that there were “tensions” between David, 78, and Castle Rock “about whether or not to turn this into a will they, won’t they?”

Louis-Dreyfus added, “Larry was livid. He did not want anything to do with the idea of romance, the cute, the sexy.”

David ended up getting his way, as Elaine and Jerry stayed good pals throughout the show — which ran for 9 seasons from 1989 to 1998.

Meanwhile, Louis-Dreyfus, 65, had her own grievances early on in the series.

Turns out her character, Elaine, “was not in the pilot” and the project almost didn’t go to air.

“NBC didn’t want to do the show, but then a guy named Rick Ludwin, who ran special programming at NBC, decided to somehow keep this show afloat and put the late-night programming budget into these four episodes,” she recounted. “God love Rick Ludwin, he’s passed away, but he was an incredibly wonderful guy, and we really have him to thank.”

When Louis-Dreyfus began filming, she knew she had stumbled upon something special.

“The comedies on television had a familiar rhythm to them, and this I’m not saying anything negative, it’s just was the case,” she mused. “This show did not. This show was sort of almost an anti-joke in a way.”

The “Veep” actress stated: “I recognized the difference on the page, and I thought, wow, this is wild. It’s like my friends have gotten into the system and fooled everyone.”

Along with Louis-Dreyfus and Seinfeld, 72, the sitcom starred Michael Richards and Jason Alexander as four friends navigating New York City life.

Co-created by Seinfeld and David, the sitcom earned many accolades during its time on the air.

In 1996, Louis-Dreyfus took home the Emmy for Outstanding Supporting Actress in a Comedy Series.