While visiting with a health care specialist at the clinic she mentioned she had run over something on the interstate and it was still stuck under her car. I suppose she was nervous about stopping so she had driven a ways before getting to work. I told her I'd go out and take a look so she went along. It was a 5 quart oil jug that someone had been using as a gas can and it still had some gas in it. It wasn't that far from her catalytic converter and I'm really glad it didn't catch fire.

Sure pays to stop and check out unusual noises under the car.