Its not an interview, but I DON’T CARE. Its a Doctor Who themed episode, with David Tennant hosting and Bernard Cribbins and Catherine Tate participating as contestants, and IT IS GLORIOUS. I laugh so hard every time I watch this, and its one of the few “videos,” if you will, of the actors that I continuously keep coming back to.
Other than that, basically every interview in Doctor Who Confidential. I don’t really watch interviews on late-night shows and the like, so those two examples are the best I’ve got. :P