2: 1967 Mercury Cougar
The Cougar was based on the Mustang, which bode well for the design. But the reliability was a bit different. The Cougar had a lot of shortcomings such as the faulty electrical components in the interior of the car. The carbureted engine had a lot of reliability issues, and this caused a lot of consumers to shift away from the car. You can find these from time to time but they are rare and maintenance is costly.
When you think of the Cougar, you think of the luxury companion to the Ford Mustang. The sad truth is that the Cougar was a let down in a lot of aspects, and the fact that it remains a junkyard find is a testament to that.