In part 2 of a three-episode arc, Louie (Louis C.K.) gets shipped out to the West Coast, to be a guest of Jay Leno’s on "The Tonight Show." And tonight (Sept. 13, 2012), Leno himself makes an appearance — as a guest on "Louie," playing himself. Just another meta episode from the year’s most inspired, original comedy. "Louie" airs at 10:30 p.m. ET on FX.