Why are they arguing? Well, because Gordon-Levitt is a contract killer named Joe whose marks are sent back to him from the future, and Willis is that very same Joe, from the future, sent back to be killed by his younger self. You know, just family stuff.
Check out the clip:
Looper also stars Emily Blunt (The Five-Year Engagement), Paul Dano, and Jeff Daniels. Rian Johnson wrote and directed the film, which will premiere at the Toronto International Film Festival before hitting theaters on September 28.