Whenever you leave the house (read: his domain), Bob gets extremely upset.  It's his world and we're just squirrels trying to get a nut, NOT individuals who are free to roam at will.  So when you get home, he runs down the stairs and hops on a chair to nuzzle you and purr and welcome you with open paws.  After your heart has been softened by this display of love and affection and you are leaning down talking baby talk to him, he'll remember YOU LEFT HIM!  Promptly those open arms of his turn into an open jugular of yours.  All in my household have, at one time or another, had to deal with the shame and embarrassment of Bob's teethmarks on our necks, or cheek, or face.  And yet every new day finds us glaze-eyed slaves bending to his will and falling for his act. One.  More.  Time.