Do I make a Ben Hur or a Road Warrior reference in the post title?

My drive to work takes me through an Interstate exit that is a popular rest stop for truckers. While I was stopped at a light this morning, I looked in my rear view and spotted something like these on the truck behind me:

(Picture courtesy of sheogre over at Flickr)

The truth about this little addition to the wheels is much more mundane than you would think: They are "Chrome Plastic Lug Nut Covers - Spike Style". In other words, there is very little danger of these babies tearing up your tires should you piss off the driver.