Who's tweet quoting Dirty Harry was Pope Benedict the four four's first formal tweet fired off for 44 days after before formal resignation for four months & four hours later?

@PopeBXVI "Knock, Knock? Ben Rat Your Zinger, ask yourself one question: Do I feel lucky? Well, do ya, pope? http://t.co/9IDx2f5Y #FASTBALL

— googolbeast (@googolbeast) October 28, 2012