"Any comic can tell you that the funniest moments in a comedian’s life don’t occur onstage. They happen in the company of other comics: in the green room, at the hotel bar, in the car on the way to the gig. That is where spontaneous hilarity occurs most reliably, and those are the moments that sustain the work onstage. “Modern Comedian” is a look at those hidden side streets and private alleyways that feed into the grand boulevard that is Comedy as it is experienced by an Audience."
From this guy.