Sometimes it takes a light touch to hit on heavy topics. With its deft interweaving of the droll and the deadly serious, using a con to end all cons, "Argo" calls up fond memories of 1973's "The Sting." For good measure, we'll throw in "One Day in September" (1999), a documentary Oscar winner about the Munich massacre. Each film looks at a hostage situation that shook the 1970s, diving deep into the story behind the headlines.