A moody Larry David gave fans of 'Curb Your Enthusiasm' plenty of cause not to embrace the spirit of his hit HBO show's title Sunday night -- announcing that he's planning on an upcoming eighth season.

David told a happy PaleyFest 2010 crowd that an eighth season "isn't definite yet. But we're working on some stuff. HBO definitely wants more of the show."

It was a case of "What a difference one night makes..." at the Saban Theatre in Beverly Hills, as a generally older, more subdued yet equally affectionate gathering of supporters replaced the giddy, screaming masses that greeted 'Glee' the night before. That's not surprising if you consider fans of a show called 'Curb Your Enthusiasm' are not likely to act like 1960s coeds watching The Beatles on 'The Ed Sullivan Show.'

In fact, it'd be difficult to describe David as happy about his appearance at PaleyFest. Maybe he was playing to his TV show character or doing a deadpan bit, but nothing about his demeanor told me David was pleased to be up there with his costars and supposed friends.

David was joined on stage by familiar series faces Jeff Garlin, Susie Essman, Richard Lewis and Bob Einstein. And while each fielded questions on how the series developed over the years and how it comes together from episode to episode, the crowd was more interested on where David might take his creation in an eighth season.

While the seventh season featured a well-received reunion of former 'Seinfeld' cast members, David indicated that was in the past. But, he didn't do it in a positive way -- putting the audience on edge by pronouncing that, "'Seinfeld' questions are not appropriate tonight." That cast a moment of gloom over the evening.

As an example of what alternative material we could look forward to in a new season in place of 'Seinfeld,' David offered up the current controversy surrounding defective Toyota automobiles and said he "might consider doing a story arc on the Prius I drive on the show." So, evidently, automobile deaths, plus a little time, equals comedy.

One theme that promises to carry over from the previous season is David's ongoing struggle with divorced life and his quest to regain the affection of his ex-wife, Cheryl (Hines). And David's unwelcome, foul-mouthed house guest (played by J.B. Smoove) would return in a new season.

Einstein played a little bit of his character (the off-color Marty Funkhouser) for the appreciate crowd. And, though I was up in the balcony and not armed with binoculars, it again didn't seem like David was all that amused. I hope he himself was playing his character. Otherwise, maybe we should all apologize for David having to be inconvenienced by an invitation to speak before a couple thousand of the people making his career and lifestyle possible. I'll send flowers.

Fortunately, other folks on stage seemed to want to be there and managed to draw some laughs from the eager crowd. Executive producer Garlin explained that he receives unsolicited ideas for possible show situations every day from fans, friends and peers.

"They all think something that happened to them should happen to Larry and would make a great episode," Garlin said. When asked if he's ever used those suggestions, he explained, "Never. Not a one. I have never heard a single funny moment in any of them."

If it's possible for just a couple of hours with the cast and creators of a show to offer genuine insight into how a series is created, it's clear that the cast of 'Curb Your Enthusiasm' is largely playing themselves. David is outwardly neurotic and gloomy. Einstein is broad and loud, etc. That explains why the show is largely improvised and only lightly rehearsed. The series essentially lets the actors be themselves.

So, if that's the case, how backbreaking could another season be?