"The Polka King" starring Jack Black, Jason Schwartzman, and Jenny Slate has the kind of story I'd like to see tackled by the Coen Brothers. It's the true story of Jan Lewan, a polka bandmaster, who devises a Ponzi scheme that lands him in trouble.
Jack Black is terrific, but unfortunately, the film's aim was more comedy than black comedy, so his characterization could never be fleshed out. He was hilarious, but Jan Lewan stole money from real people. It would have been great to see more of both sides.
It's definitely worth seeing for Black and all the polka stuff, but make sure you watch through the credits for not only updates but a look at the real Jan Lewan, an immigrant who knows the true meaning of survival.