Bill O'Reilly Fires Back At Jon Stewart Over War On Christmas, Calls Him 'Pinhead' (VIDEO)

Bill O'Reilly struck back at Jon Stewart on Friday, taking their newfound Christmas feud to another level.

O'Reilly and Stewart have long since settled into a comfortable, love-hate zone with each other, and their latest skirmish bore all the hallmarks of a seasoned comic duo. It all began when Stewart zinged O'Reilly and Fox News for the network's continued commitment to hyping the so-called "War on Christmas." O'Reilly then fired back by telling Stewart he was going to hell.

Stewart took to his show once again on Thursday, telling O'Reilly, "I make my living watching Fox News eight hours a day. I'm already in hell!" Cue audience applause, naturally. "Your move, O'Reilly," Stewart challenged.

On Friday, O'Reilly used his "Pinheads and Patriots" segment to respond.

"My move, Stewart?" he said. "All right, here's my move. How can you watch eight hours of Fox News every day and still be a pinhead?"

Some more O'Reilly feuds:

Bill O'Reilly feuds