You stand back quietly not interfering as he goes through files and drawers and closets and cupboards and takes whatever he wants. You smile cordially and ask if he needs some bags to carry away the haul. You thank him for the visit and tell him you look forward to his next visit and let him know you are counting the days until you can see him again assuring him that you will have plenty of bags on hand for him to use for his next haul. Preposterous? Or not at all?
