In the mid-1970s, teen skateboarder Jay J. Adams descended on an empty swimming pool in Southern California, with beers and board in hand. A drought had recently ripped across the state, forcing residents to drain their backyard swimming holes. For many, it was a disappointing summer. But not for a crew of misfit young skaters known as the Z-Boys. From their vantage point, those smooth concrete craters made perfect skate bowls—sanctuaries for a sport and subculture they were unwittingly pioneering.