There are some things in this world that we want to do, yet societal pressures and practicality combine forces to stop us. Whether its eating a Baconator or dancing to the Wiggles, you would never be caught dead by your friends or family doing it. There are cars that bring up the same feelings.
I'm going to go ahead and suggest the Lamborghini Countach. That may be a bit controversial, so hear me out before you start foaming at the mouth about "supercars" and "Lamborghini" and "weren't you the one who made such an eloquent and stirring defense of all that that is good and holy in the world." Yes, I get what the Lamborghini Countach is all about. It's about being outrageous, it's about being vulgar. I know.