Entertainment Tonight ET Online ETOnline.com

The Cheers gang was back together again in Beverly Hills over the weekend as the show creators hosted their 30th anniversary dinner, and ET acquired exclusive access to this once-in-a-lifetime event.

RELATED: Drink Up! Cheers Celebrates 30 Years

Sam, Diane, Rebecca, Dr. Lilith, Cliff, Carla and Norm all sat down with Nancy O'Dell for a rare night where they all gathered under one roof.

"Once a month for years we met at Ted's house on Thursday and played Twister," joked John Ratzenberger. "But then [Ted] moved."

"There was a really ugly fight," Ted kidded.

Absent from the event: Woody Harrelson and Kelsey Grammer -- both out of town on business. Woody was shooting The Hunger Games sequel on location while Kelsey was in London, promoting his Starz original series Boss.

RELATED: Danny DeVito and Rhea Perlman Separate

All of the cast members have continued to stay busy after the show. So much so that they might not have time to catch up on each other's projects. When asked if they'd mind being "on the slab" for Ted's hit drama CSI, John Ratzenberger and George Wendt were stumped.

"They don't know that I'm on a TV show," Ted whispered to Nancy. "You'll have to tell them."

At the end of its 11-year run Cheers was still pulling in around 26 million viewers, so it might be hard to imagine that program just barely escaped cancellation after the first season. The sitcom's initial fan base was small, but it included one crucial member -- then-chairman and CEO of NBC, Grant Tinker.

"All of [Grant's] people around him were telling him to cancel the show, because we were dead last in the ratings," John explained. "He said, 'No, it makes me laugh.' ... so he gave us another year and that September -- the first week of the second season -- we won a bushel basket full of Emmys."

VIDEO: Ted Danson Says Shelley Long Put Cheers on the Map

The show earned a total of 28 Emmys while on the air, and is still widely regarded to be the best sitcom of all-time.

Watch ET tomorrow for more with the cast of Cheers and Kirstie Alley's wild stories from the series finale.