[Wolfstar]

In auto racing, stuff abraded from tires migrates outside the racing groove. It's called "marbles." In NASCAR, when a car wanders outside the racing groove into the marbles, it usually winds up in a spin, in the wall, and often it collects a bunch of other cars in THE BIG WRECK. As long as no one is hurt, it's a pretty cool show.

[spoiler2]

Can you imagine enviromentalists calling for legislation to ban racing's popular smokey donut celebrations?

I can see real legal problems here for drag racers, too, if this nutball-science stuff gains any traction!