I heard that the Stanley twins had one advertising gimmick, where one of them entered one end of town and raced at high speed. Just as a traffic cop was ready to pull him over....along came another identical car, with an identical driver, speeding along in the opposite direction!
They had that cop seeing double! It is said that "They'd give a free Stanley to anyone who could hold the throttle open for five minutes!"
http://http://www.auburnheights.org/stanleyhistory/stanleyhist.asp (broken link)