Bad day on the assembly line?

I worked for Oldsmobile in the early 90's and this 98 kept coming in with a noise when you take off or stop. Everyone worked on it and it made it over to me. I finally started taking the back seat out, side panels, and there it was a 1" steel ball bearing in the right side panel behind the door rolling up and down the rocker panel. Some smart a$$ on the assembly line LHAO.