23. Plymouth Superbird
As one of the craziest muscle cars ever produced, the Roadrunner Superbird has one of the most recognizable designs ever. To homologate the car for racing, Plymouth built it for one year only in 1970. They produced just under 2,000 road-going Superbirds, selling them all over America (via FOX News).
Plymouth based the Superbird on the Roadrunner, equipping it with a 440 V8 as standard and 426 Hemi as the only engine option. However, to make it as aerodynamically efficient as they could, Plymouth installed a nose cone, hideaway headlights, and an enormous spoiler on the back.