Horror doesn’t hand down commandments from a mountaintop; it scavenges from headlines, folklore, and fear, then welds those scraps into images we can’t shake. We open the vault on a Halloween favorite to map where the genre’s “rules” actually come from—Lover’s Lane, masks without faces, babysitters on the edge, clowns that cross lines, and formless things that fall from the sky. The trail starts with the Texarkana Moonlight Murders and the media-born “Phantom Killer,” threads through the brut...