An employee was parked in a residential incline driveway. The customer asked if the employee could move his truck. While backing up the vehicle, the right side of the vehicle was off the driveway in the grass. The employee exited the vehicle to look. The vehicle was still in reverse at the time. As the employee exited, the vehicle continued to reverse, and the driver's door struck and knocked him to the ground. The left front tire then ran over the employee, injuring his ribs and chest and possibly collapsing his lung.