Using the handle "Phantom Expander," the self-righteous vandal has taken to filling the tailpipes of offending cars with self-expanding foam. So far, the four-hour set time of the foam has been the saving grace for the Phantom's victims, most of whom have been able to clear the exhausts before the intended plug has dried. Vehicles with fully clogged exhausts will not start, and repairs could get expensive if other components are damaged.
For now, the foam bandit roams free, but it's only a matter of time before someone gets caught with a can of "Great Stuff" in their hand. Will it be the constabulary or a car owner that catches them? For the foamer's sake, it might be best to get nabbed by the police so that they can keep all of their teeth.