"M'beat, let's just cab it over to my place okay?" World-weary and without any pre-empting, Penny gets the door out for Mary, leaving her cup behind for the staff to clean-up after. So efficient here, they even swipe down the mess of sugar and stirry things. Holding the door open with her booted foot, Penny zips up her jacket and amscrays. See, that's the nice thing about assumptions; generally they're never wrong.