Photo by thisisbossi You kinda had to see this one coming. With the advent of a Barnes Dance-style pedestrian crossing at 7th and H streets NW, a handful of locals have planned a whimsical “Barn Dance”-themed flash mob at the spot. Courtesy the DCist tipline, here’s the Facebook page to sign up for tonight’s hoedown, during which participants sporting “overalls, plaid and straw hats” will “do-se-do” through the busy Chinatown intersection. Between the dozens…