Well yesterday, my gf was getting out of my car and closed the door. And when it closed I heared like a metal piece shook inside my door.

I got home and opened the passenger door and started just shaking it. It sounds like something metal is bouncing around in the door. If you were looking at the inside of the passenger door, it is coming form the lower bottom right.

Anyone have any idea, before I go tearing into my door panel?