You've seen Jack Black Rock it in "School of Rock," and last Saturday he shows he stills loves to headbang giving an impromptu performance of Black Sabbath's "War Pigs" at a wrap party for him upcoming film "Gulliver's Travels." He kicks back a few WHILE he is in the middle of it but poor Jack can't enjoy his set due to some guy who can't stop chatting him up. Good job Jack of not strangling him with your mic cord. There are also reports that he sang a Michael Jackson tune with his wife too.



 

     

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