21: 1958-1960 Ford Edsel
The Edsel was supposed to be a revolutionary new car that changed the way people looked at a family car. When the Edsel debuted in 1958, it had a unique design from the inside out. The dashboard used an electronic shifting mechanism that used buttons instead of a traditional column shifter. This was just one of the new features introduced on the Edsel and one of the many reasons the car was a sales flop (via Motor Biscuit).
Part of the reason for the decline in sales was because the car introduced too many new features at once. Consumers weren’t ready to adapt to all the new technologies used in the car. The reliability was also questionable and the car would spend more time in the shop than on the road.