WATCH: Jack Black Reveals How He Became the King of Polka

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In the based-on-a-true-story movie The Polka King, Jack Black plays Jan Lewan, a charismatic Pennsylvanian who, believe it or not, used the art of polka to bilk his fans out of money. Black reveals how he turned himself into Lewan and what exactly the two have in common.

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Jack Black Reveals How He Became the King of Polka