Back in the days when Ford owned Landrover, they parked all the overflow export cars inside the engine plant at Dagenham, the keys were left in the vehicles - it had been like this for years, until one day ten people walked through 'security' wearing high-vis, a surly look and daysacks, just like the rest of the plant workers.
They sacrificed one Range Rover Vogue taking out the fence and took ten out up the embankment straight onto the dual carrigeway, never to be seen again.
Insurance didn't cover the £1m+ losses, within a day, stillages were placed against the fences, the keys were still in the cars though.