He made his name as the host of Big Brother's Big Mouth, the discussion and audience-interaction follow-up to the Big Brother show itself. His quick wit and surreal, articulate wordplay were quite refreshing; he did the best thing for himself by leaving that show before it became stale - many of his successors have generally abused their own audience for laughs, and the show has generally gone down hill since he left.
I don't find him all that funny anymore.