Are You Listening? The Listener “I Am An Adult” Thursdays, 9/8 C, NBC Written by Michael Amo Directed by Clement Virgo I’m not sure how the math on this show went: Third Watch plus Mediumplus some generic PI show equals a hit? The Listener mixes genres like fruit in a blender, seeking just the right mix. This can be a risky idea—just ask the creators of Firefly or Brisco County, Jr. There’s a chance, though, that audiences in America are ready to try something a little different during this summer of lowered expectations. After all, it has to be better than re-runs and reality programming, right? This Canadian television…