Bruce Willis and Joseph Gordon-Levitt in TriStar Pictures'
In the cerebral sci-fi thriller "Looper," opening wide this weekend, Joseph Gordon-Levitt stars as a time-travelling hit-man confronted with the unenviable task of whacking his future self (played by Bruce Willis). Since launching the Toronto International Film Festival earlier this month, Rian Johnson's film has generated plenty of critical praise and lots of early buzz. We all know JGL and Willis won't disappoint, but here are five facts about "Looper" you might not know.