The bar carts have got brakes, red and green foot pedals for 'stop" and "go", I personally have known of the odd escapee and it's not something to be stood in the way of as it hurtles it's way to it's fellow bar carts in the rear galley.
Best fun though was, on a positioning flight, getting two of the service trays beneath one's feet and skiing down the aisle after take off ... but, if one doesn't get it right, it hurts when one arrives in the rear galley at a fast rate of knots
