'If I had My Gun I'll Blow Your S*** Up'

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Shia LaBeouf went on a racist, violent rant in the police car after being arrested early Saturday morning in Georgia.

Shia screamed at the cop, "If I had my gun I'll blow your s*** up." And that wasn't all. He said, "You put your own kind in the f***ing pen."

As we previously reported, Shia also ranted about being an American who pays his taxes ... and on, and on.