Bugeye Seats parts are often rusty. The seat bottom trays rust from moisture that gets into the footwells, and the seat backs often rust along the bottom edges where they are closest to water that gets into the car if they are left out in the rain.
This is the first time we have seen a rusty seat back higher up. It was fine when we got the car, but after a few test drives the seat back got all wiggly, and we removed the cover to find that rust had attacked this seat back in the middle section. A new seat back fixed the problem right away. In the meantime we got another fun video of something we had not previously seen.