Car v. Car in my most recent case, but it was my cycling habit that saved me from damage.

Driver behind me wasn't paying attention and just slammed 35mph into the arse end of SuperJeep at a stoplight. My Thule Parkway was attached to the hitch at the time, and she totally obliterated the front end of her Forester. Total damage to SuperJeep: Matching paint marks on the bumper where her car was wrapped around the hitch post.
She bought me a new bike rack and we called it even. She had to replace the entire front end of her car. Easily a $4000 job.