This could be a fun thread. How many of you have concocted a sinister device designed to twart the throngs of morons riding your bumper as if trying to read your speedometer?
Maybe you would like to share your ideas?
How about a hollow fiberglass shaft with a series of small holes near the tip spraying WD40 in a fine mist? Not as messy as 007, and fairly easy to wash off during the unscheduled pit stop.