 Mr. Burns moves in with Smithers and , wanting to be of use , decides to do Smithers ' grocery shopping . However , he is unfamiliar with grocery stores and becomes confused by the ketchup and catsup , causing the grocer to send Burns to the Springfield Retirement Castle . While at the home , Mr. Burns meets Lisa again , and begs her to help re @-@ build his empire . She eventually agrees on the condition that he drop his evil ways , and the two begin earning money through recycling . 
