THAT 80 % !
In 1949, as a very new "Joy-riding" pilot flying an Auster I was asked to " Loop the Loop" by some of my passengers. This was NOT allowed - by those in authority. ( We did have lap-straps.)
Instead I would push the stick forward and some of the young ladies would squeal. On pulling the stick back, they became silent again.
I ought to have collected, and kept, the statistics. But pprune did not exist to tell .
Perhaps fear of the unknown, how far will I drop, is worse than a hardening cushion!
80 % would seem right... It must have been much more than 50%.