Libertarian bumper stickers

Bumper stiker politics are truly an US speciality, at least judging by the quantity of cars on the road with bumper stickers, most of which reflect an appaling lack of originality or even thought of any kind: “support our troops” (how? why?), “united we stand” (for what?), “proud to be an American” (why? ever been abroad? have any idea at all about the rest of the world?), or the inevitable