Description:Joseph Gordon-Levitt, Emily Blunt and Bruce Willis premiered their new time-travel thriller Looper at the Toronto International Film Festival Thursday night, and the stars weighed in what they'd do if they could travel through time themselves! Watch the video… Video: Joe & Emily are Loopy for 'Looper' Looper, in theaters September 28, finds Gordon-Levitt is a time-traveling hit man from the future tasked with taking out the older version of himself -- played by Willis. When the mob wants to get (2:40)