Michael Keaton remembers Harold Ramis, tackling Shakespeare, Ron Howard's 'Gung Ho'

In the first of a series of interviews with "Birdman" star Michael Keaton, the Oscar nominee discusses his early obsession with comedy, working with Harold Ramis on "Multiplicity," braving Shakespeare with Kenneth Branagh and owing a debt to "Night Shift," "Gung Ho" and "The Paper" director Ron Howard.