As cocaine consumption falls in the United States, South American drug traffickers have begun to pioneer a new soft target for their product: big and increasingly affluent Brazil.

And the source of the cocaine is increasingly Bolivia, a landlocked country that shares a 2,100-mile border with Brazil.

As Brazilian police officers and border agents can attest, the drug often finds its way to Brazil by crossing the Mamore River, which separates the state of Rondonia from Bolivia in the heart of South America.

The Italian art-house film Caesar Must Die and the teen zombie-comedy Warm Bodies do not, at first glance, appear to have much in common. But they share a bit of creative DNA, both being inventive riffs that turn Shakespearean tragedies into something else entirely.

Adapted from a French graphic novel and outfitted with an ethnically diverse cast, Bullet to the Head is an artifact of a newly internationalized Hollywood. But that doesn't mean it feels especially new.

Intended as a victory lap for three great stars of advancing age, Stand Up Guys is another entry in the "old folks doing stuff" subgenre, which offers comic affirmation that life is not strictly for the young.

Editor's Note: This review was edited and published before news of Koch's death broke. The headline has been updated to reflect that news, but the text of the review is unchanged.

Dave Grohl has always been a joy to watch onscreen, whether bashing away at a drum kit like the heavy-footed, wild-haired spawn of John Bonham and the Muppets' Animal in Nirvana's "Smells Like Teen Spirit" video, or flashing an endearingly goofy grin in the Mentos-spoof clip for the Foo Fighters' "Big Me." And a big part of that appeal is the sense that no matter how long he's been in the business, Grohl is still a guy who is acutely aware that he's living out a teenage daydream every day of his life.