On the eve of the last presidential debate, stars aplenty took to Comedy Central to help raise money for and awareness about autism programs, an all-celebrity-hands-on-deck spectacle that included a mock debate between two media gasbags.

“Daily Show” host Jon Stewart took great pride in bringing together polar opposites Chris Matthews and Bill O’Reilly, of MSNBC and Fox News fame, respectively, for a first-ever helium-fueled showdown.

Here’s the pair insulting each other at the onset: