The Simpsons Comic Book Guy Let Your Geek Flag Fly poster autographed, doodled with Bart Simpson's head and dated 2007 by Matt Groening, the legendary cartoonist and creator of the show. Poster measures 16 by 20 inches. Obtained at 2007 Comic-Con. HAS MODERATE FLAWS AND WEAR (MAINLY CREASES ALONG THE LEFT EDGE). With certificate of authenticity from AutographsForSale.com. ONLY ONE AVAILABLE FOR SALE.