Like reading bumper stickers on other peoples cars but I don't have any on my cars. Don't like what the stickers will do to my paint.

But if you want to be invisible an older car or truck with a subdued color is your best bet. My truck is a white 98 and is very invisible and it does not stand out. My cars on the other hand are sports cars, they all draw varying degrees of attention and are "social" cars. They don't need bumper stickers to stand out, most of the attention is positive but once in a while. And the more expensive a sports car looks the more likely you are to come across a real bozo once in a while. Also every ricer wants to street race, they get ignored. But if I have a choice of driving a mundane car or one that makes my right foot happy....