It’s not just Woodstock, although that’s certainly the most popularly remembered moment in the history of the counterculture. ‘69 is the year that popular views of the movement, with its hippies and music and distinct aesthetic, saw it becoming twisted and horrific. This shift in perception was thanks largely to Altamont and the Manson killings (and, though less relevant, the Zodiac killings). If you’re talking about horror in the 60s, it’s going to be ‘69 - the year that, for many Americans, hippies became monstrous.