Jack Black karaokes for UNICEF

He played a rocker wannabe in Tenacious D in The Pick of Destiny. He played a rocker wannabe in The School of Rock. He played rocker wannabe Paul McCartney in Walk Hard: The Dewey Cox Story.

Yes, I am talking about Jack Black. It should not be a surprise that he sang a little karaoke for the recent UNICEF benefit. The pic is of him singing War Pigs from Black Sabbath.