If I backed into a car illegally parked behind a obviously refrigderated who is at fault? 
That 's a great question ! I hate to be the bearer of bad news , but my bet is parked illegally or not , since you were the one that caused the damage , it is going to most likely be your fault . You may get lucky and your lawyer may be able to argue out of it , but generally the one who causes the damage is liable , regardless of the circumstances . Good luck ! Thanks for asking . 