Gear shifter was stuck in the car. Can happen at random times. For no reason at all, the gear shifter refuses to budge out of park, or reverse, or drive, and essentially bricks the car. Car refuses to move. Car refuses to respond to accelerator or brake pedals. Can happen in the middle of the road, or in a parking lot late at night when you are trying to leave a sketchy area. Can be an extremely dangerous circumstance, and Ford is trying to avoid attention to this at all costs.