The Crimson Permanent Assurance

In the bleak days of 1983, the Crimson Permanent Assurance, an accountancy staffed by elderly workers much like a slave ship, has been taken over by efficiency-minded corporate types. When they sack an employee, there's an uprising, and the building is unleashed from its moorings to sail across the (dry) ocean and take on the financial centers of the world, starting with an all-out attack on the large skyscraper housing The Very Big Corporation of America, complete with filing-cabinet cannons, ceiling-fan broadswords, and paper-spindle short-swords.