I can't find it any more. There was something otherworldly about it - the few minutes of video on youtube.com from film from a small town Idaho television broadcast circa 1959. It was one of those Saturday-afternoon type shows, where locals got a little air time. (Most programs at night and weekday mornings back then were from national broadcasting companies.)
This youtube clip had about a dozen high school kids doing the walk, a kind of dance or promenade that actually has ancient roots, to a popular slow-rhythm radio melody. The boys were on the right side, the girls on the left. One by one, they paired up, and kind of boogy-walked slowly down the middle of the lines. They looked camera shy - all of Idaho was pretty rural - and earnest, dressed in their best, stepping away from childhood into adulthood.