Bill Hader became popular on "Saturday Night Live" with silly characters like Stefon, but his titular character on the HBO show "Barry" is more twisted and brilliant. It’s a great dark comedy about a hitman who wants to become an actor and how his worlds collide. In this conversation with “The Envelope” host Mark Olsen, Bill brings both the fun and the darkness: He’s pleasant and light, and he laughs while talking about some of the most disturbing things on his show. Read the full transcript here.