When Norman Bates, dressed as his mother, ripped open Janet Leigh's shower curtain and knifed her to death in "Psycho," horror movies changed. Along with Leigh's blood, classic horror style and romantic figures like Frankenstein and Dracula went right down the shower drain. For better or worse, style often became as important as substance, and booming box-office numbers proved that horror was serious business. The shifting times created opportunities for filmmakers to innovate, finding new and terrifying ways to scare the pants off audiences.