There was a time, at the beginning of the 2010s, when American automakers weren’t ready to unleash the full potential of their pony and muscle cars because the market wasn't quite ready for all that rowdiness. But the likes of the Shelby GT500, Camaro ZL1, and Challenger Hellcat pushed the envelope by a huge margin, and thanks to them, there's no going back. None, however, made it quite so obvious as the hair-raising Challenger SRT Demon.