It's not every day that Bill O'Reilly is called a 'pinhead' to his face, but today - playing off the title of his new book "Pinheads and Patriots" — that's exactly what co-hosts Joy Behar and Barbara Walters did on the set of their ABC hit chat show "The View".

Getting into a heated argument about the proposed Islamic center which will be located two blocks from Ground Zero in Manhattan, the Irish American pundit thundered that 70% of Americans did not want it to be built there.

And then, in a moment that saw all hell to break loose, O'Reilly claimed that President Obama's popularity has declined due to his position on the proposed mosque, saying that the majority of Americans don't support it because "Muslims killed us on 9/11."

For Joy Behar and Whoopi Goldberg this claim, that Muslims rather than Al Quaeda extremists attacked the twin towers, was a bridge too far and they walked off the set in disgust.

After the the two co-presenters swept off, broadcasting legend Barbara Walters criticized their actions and claimed that they should have been able to have a rational discussion without leaving, but then in her next breath she gave O'Reilly a tongue lashing, demanding that he apologize to Muslims for lumping them in with a core of hardened extremists. Begrudgingly, O'Reilly complied.

Then, bizarrely, Elisabeth Hasselbeck defended O'Reilly by claiming that it was really President Obama who was to blame for the confusion over who attacked us on 9/11 - Muslims or extremists. Hasselbeck didn't offer a complex reason for why she held this opinion.

You can catch the morning mayhem in all its glory below: