I'm sure this is not a common thing, but about a year ago, I noticed the driver's side of my rear bumper had a small (about 1 inch) dimple in it (not very deep). I thought maybe someone had bumped into the corner of my car, but there were no scratches or anything. Over the last few months, the side of the bumper has become deformed, with some waves developing in the plastic. Anyone else had anything like this happen? It's not real noticeable, but I know it's there, especially when the light hits it just right.