Jon Stewart made the surprise announcement this week that he will be stepping down as the host of Comedy Central's "The Daily Show."

Stewart, who has hosted the satirical news program since 1999, did not specify when his last show will be, nor did he say what he plans to do next.

Over the course of the 16 years that Stewart has hosted the show, he has been a frequent guest on "The O'Reilly Factor," regularly - and hilariously - butting heads with Bill O'Reilly and striking up a most unlikely friendship.

On Thursday night's O'Reilly Factor at 8/11p ET, don't miss Bill's special look back at some of his most memorable and hilarious clashes with Stewart!

Below check out some clips from a few of Stewart's "Factor" appearances.

November 11, 2014

September 22, 2010