Comedian, actor, and writer-director Mike Birbiglia broke through to a national audience with three Comedy Central specials and a number of segments on Ira Glass' beloved NPR show This American Life. Glass went on to produce two feature films written and directed by Birbiglia: 2012's Sleepwalk with Me and the new improv-themed comedy-drama Don't Think Twice. Birbiglia has also forged a career as an actor, in films such as Adult Beginners, Annie, The Fault in Our Stars, Your Sister's Sister, Cedar Rapids and Trainwreck. Birbiglia chatted with me about Don't Think Twice and the world of improv (adding his Animal impression for good measure).