TL*THE CONTACT OWNS A 2001 FORD EXPLORER SPORT TRAC. THE CENTER ROW CENTER SEAT BELT TIGHTENED BY ITSELF BEFORE THE VEHICLE EVEN MOVED. THE CONTACT'S 8 YEAR OLD CHILD SUSTAINED A BRUISED HIP. THE DEALER STATED THAT THE SEAT BELT WAS ENGINEERED TO TIGHTEN IN THAT MANNER. THE FAILURE MILEAGE WAS 20,000 AND CURRENT MILEAGE WAS 36,364.