The AFI really is on a roll with its AFI specials of late. Last year’s tribute, to Diane Keaton, was spectacularly warm and amusing, and this year’s tribute (shown earlier this summer on TNT), to George Clooney, is another instant classic. Gathering to honor and/or poke fun at Clooney are such luminaries as Jimmy Kimmel, Jennifer Aniston, Courteney Cox, Julianna Margulies, Bill Murray, Richard Kind, Don Cheadle, and Clooney’s wife, Amal, and father, Nick. And the tribute is followed, at 9:30 p.m. ET, by a TCM telecast of one of Clooney’s very best films, the Coen Brothers’ 2000 masterpiece, O Brother, Where Art Thou?