Here's a picture of the car part that we lost from Nathan's car on our way to Montana last month. It belonged inside the wheel well above one of the tires. You can imagine what an awful sound it made as it dragged along the highway beneath us.
Nathan and I have been through worse disasters, so we stayed calm, pulled over and removed the offending car part. Not being litterbugs, we hauled it to the next rest stop and disposed of it in the garbage can. We weren't sure what purpose the lining of a wheel well serves and in the end decided that it is a lot like an appendix.
Appendixes (or is it appendices?) are nice, or at least interesting, to look at but are functionally useless. I know. I've seen my own appendix looking cute as it sat there doing nothing. (Ever had a colonoscopy?)