Went out to dinner with the wife. As I was pulling in the driveway all of a sudden I get this insane metal scraping noise. Only heard it when the car was moving. Not when in neutral with throttle. pulled the ebrake walked around the car opened the hood. Did not see anything and the car kept running no issues. I backed out of the driveway and pulled back in and it went away. I sounded like metal against metal almost nails on chalkboard but very very loud. I assume I got a rocked or something wedged in the a brake or something. I drove around for about 5 miles or so to see if it came back but it didn't.