(another not-A body-related one)
A friend of mine used to borrow his older sister's late-70s Camaro (this was back in the early '80s). The driver side door was making a rattling sound, so she took it to the shop. They pulled the door panel and found beer bottle caps- about 3 inches deep. He would drop the caps into the opening around the inside door handle when he opened a beer.
He never got to use her car again after that:dontknow: