“Mailbox baseball,” the act of hitting an unsuspecting mailbox with a baseball bat out of a moving vehicle, is a niche yet important part of the mythos of American life—a relic of Americana that lives on in classic coming-of-age stories and family folklore. If you've ever poked and prodded an older member of your family who grew up as a bored child back in the days when kids and teens roamed wildly unaccounted for, you've probably heard some of these stories. Beyond that, if you're living in a…