Bob, Space Cadet
I usually describe Bob to others as a waste of oxygen or a 'Walking Vegetable'. Most people will ask, "what's a walking vegetable?" Well, a vegetable when refering to a person, is someone who is clinically brain dead. They may still be breathing or kept alive by machines but their brain is no longer functioning. They are basically dead but still breathing, unable to move. Bob's brain has stopped functioning but he is still mobile. I believe this may be the first known example of a 'Walking Vegetable'. Perhaps science should take notice.