According to the neighborhood loop, Fio's security is threatened not only by mystery cars, but also by the most hardened criminals of all--kids. They're supposed to be putting a Drano and tin foil concoction in plastic bottles and tossing them around for unsuspecting adults to pick up and thus blow their fingers off. Hmmm--if the combination is so volatile, why doesn't it blow up the kids?
Aside from the fact that the only young'ns in our area are people's visiting grandchildren and that no one around here would stow Drano under the kitchen sink because we all have septic tanks, this is an urban legend that's been making the rounds for many years.
As Fio told you, she lives in paranoia central.