Has anyone else been getting some weird noise sounding like something just hit the side of your car? It's happend a couple times since I bought the car new in may 2009. Once I was just pulling out of a parking lot and a loud thud noise came from what sounded like one of the rear panels buckling. Then another time, same very loud noise when I was backing out of a parking spot. It sounds like someone just threw a ball at the side of my car.The car had not been sitting in the sun or cold or been sitting in any tempurature changes. Anyone else have this happen to them?