The sound of cheerful whistling preceded Charlie up the narrow stairs that led to Susan's flat. Not even their jarring familiarity put a damper on his mood. A couple of Muggle plastic bags hung from one hand, another moderately sized paper sack floating before him with the help of his outstretched wand. As he got to the door, he realised his conundrum, and rather helplessly called out. "Susan? If you're free, would you mind getting the door? I'd knock, only it seems I've run out of arms... and hands."