The annals of filmmaking are filled with stories of people who managed to make films against all odds, without money, without shooting permits, without proper professional equipment. This Is Not a Film, or In Film Nist, the 75-minute film directed by Iranian filmmaker Jafar Panahi and Mojtaba Mirtahmasb, may be the ultimate achievement in stealth filmmaking. Panahi is currently serving a six-year jail sentence and has been banned by the Iranian government from making films for 20 years. And yet somehow he has made a movie that has found its way to one of the world's major film festivals. This is Not a Film is a small but significant message in a bottle.