Coppola's Megalopolis leaves Cannes scratching its head

Every year the Cannes Film Festival has its hottest gig -- a film so breathlessly anticipated and a justification of the festival's raison d'être. This year, that honour belongs to Megalopolis. Or, to be completely faithful according to the plaque flashed up on the screen, Francis Ford Coppola's Megalopolis: A Fable.