I've got two.....1st was 20 or so years ago, towing a 1200 race car with a V8 Holden ute. We were approaching a railway crossing, the lights weren't flashing or anything but the woman in the Corolla in front of us decided to stop anyway !!! We hit the little Toyota so hard the car broke its strops and fired into the back of the ute clearing the tray and smashing into the back of our heads. We were both ok and the driver in front had got a huge shock. We were on State Highway 1 and held up traffic and also a train until things got sorted.. We hauled back to base borrowed another tow wagon and hauled back north to the track with the virtually undamaged Datto.
Story 2. We were A barring an RX2 back from the panel beaters where it had just been straightened after a rally prang. Going around a roundabout the A bar snapped and the Mazda rolled off into a car bending the same chassis rail again...