Through an open window, a homeowner in Wisconsin took aim at a boy whose ball had bounced onto his front lawn and shot him in the butt.
Within days, other homeowners were firing all sorts of guns at trespassers too. Some even began shooting at visitors.
As the news spread, people everywhere grew skittish about leaving their homes. Many stayed inside and no longer opened their doors.
A pandemic caused the First Shut-In. Fear caused the second.