It's official: "The View" co-hosts Whoopi Goldberg and Joy Behar are not to be messed with. Goldberg and Behar let their feet do the talking during a heated discussion with FOX News host Bill O'Reilly on Thursday's show. While promoting his book, "Pinheads And Patriots: Where You Stand in the Age of Obama," O'Reilly declared that "Muslims killed us on 9/11." In her best "Oh-no-you-didn't" voice, Goldberg snapped back, "Oh my God, that is such b******t! When Behar tried to get a word in, O'Reilly shut her down with this gentlemanly phrase: "Listen to me because you'll learn something," both women walked off the set, clearly outraged. O'Reilly later apologized, and Behar and Goldberg returned. Funny, resident conservative Elizabeth Hasselback had nothing to say. What do you think? Did Whoopi and Joy overreact or was their walk-off justified?