The chairlift on Ruud Mountain at Sun Valley in 1947 had a very peculiar characteristic. It ran as though it had a mind of its own. If you didn't sit down gently when you started your ride, and jumped on instead, this would start the cable bouncing.
"A good scientist is a person with original ideas. A good engineer is a
person who makes a design that works with as few original ideas as
possible" - Freeman Dyson