There was an angry explosion on live TV as two co-hosts of The View stormed off the show.
Whoopi Goldberg and Joy Behar walked off the set in the middle of a bitter argument with Fox News's Bill O'Reilly, drawing an extraordinary rebuke from Barbara Walters.
"You have just seen what should not happen, we should be able to have discussions without washing our hands and screaming and walking off stage," Walters told the audience.
So what was the cause of that jaw-dropping moment?
Goldberg and Behar looked distressed from the very beginning of O'Reilly's appearance as a guest on the show to promote his new book, Pinheads and Patriots.
O'Reilly soon commented on what he perceived as Goldberg's unwelcoming body language, and said, "Every time I come on here she's like, how did this happen?"
"Bill, I have a case of gas, that's all that's wrong with me," Goldberg countered.
Tension escalated when O'Reilly weighed in on the controversy over the plans to build a mosque two blocks from Ground Zero in New York City.
"Listen to me, because you'll learn!" said O'Reilly.
"Pinhead! Pinhead!" Behar exclaimed.
But things really blew up when O'Reilly called the location of the mosque "inappropriate" because he said Muslims had attacked the Twin Towers.
That's when Behar and Goldberg took the unheard of step of walking out, and they stayed off the set for close to two minutes.
They only returned when Walters criticized them on live TV, and took O'Reilly to task as well.
"You should apologize," she told O'Reilly.
He said, "If anybody felt I was demeaning all Muslims, I apologize."
"We're back because you apologized," Behar said as she walked back on set.
But the rest of O'Reilly's appearance remained tense as Goldberg and Behar sat stone-faced.