The funniest "food-in-a-car" bear story I ever heard was from a ranger in Sequoia National Park as he was admonishing the park visitors at his fireside chat to use the metal food containers at their campsites.
He told the story of a summertime visitor who put his food in the bottom of his sleeping bag and then proceeded to put his bag in the back of his station wagon. Being a warm night, he left the tailgate down. During the night a bear came along, grabbed the sleeping bag, pulled it (with the rudely awakened individual inside) out of the station wagon and dragged the occupied bag and all down the road.
The guy eventually got the bag unzipped and lightened the bear's load.
I bet that bear found more than just food in that bag...and it didn't smell nearly as good.