From Doogie to Barney to Hedwig, Neil Patrick Harris breaks down his most iconic characters

Neil Patrick Harris breaks down a few of his most iconic characters, including ‘Harold & Kumar,’ ‘Doogie Howser, M.D.,’ ‘How I Met Your Mother,’ ‘Hedwig and the Angry Inch,’ ‘Starship Troopers,’ ‘Gone Girl’ and ‘Uncoupled.’