Iron man's reign of destruction and snacks (that pun really only works aloud) is hard to miss, if you have working eyes and ears, and the Doctor watches with a look midway between incomprehension and judgment, as though he's starting to suspect he's on the wrong train. Possibly because he's just watched a fellow passenger eat something off the floor. "Is that why you put them on the floor, is that like dip for you? Probably should have left the rest, until you knew how much you wanted. Not everyone likes dip. Or...floor."