MythBusters 2009x9

Adam and Jamie see if it's possible to cling to the roof of a speeding and swerving car like it's done in action movies. Kari, Tory and Grant try to break out of jail by cutting their way through steel cell bars -- using only dental floss. Did an 18th century prisoner once put his ball and chain -- shackled to his ankle -- in the prison cannon and fire himself over the prison wall to freedom. Is it possible?