With all due respect, when I was a young engineer and a new pilot I worked with a technician who was an avid skydiver. Their club owned a plane but none of them were pilots so I had an opportunity to build some hours for free and enjoyed flying that Cessna 180 sitting on an orange crate with no doors on the aircraft while they leaped, sometimes to broken bones, scrapes, etc, That said, I see absolutely no reason, now or then, for anyone to get out of a perfectly good airplane (which is any airplane whose control surfaces are intact). Therefore I would classify those big balls as repurposed grey matter.