details please - what was the context of the exchange, I assume it was Rove/Plame/Wilson?
They were going to talk about the cia leak case. Ed Henry who is hosting inside politics said he had asked Novak in advance that he was going to bring it up.
At the time Novak flipped out they were talking about Katherine Harris and Carville said something to the effect that he was trying to look tough for the editiorial pages. That is what set him off. He must have been agitated already.