Wonderland, a video by artist Hye Yeon Nam, was a runner-up in the Grand Prize category of the Metropolis Art Prize 2009. The artist describes the apparent backwards movement of everybody but her as an "attempt to convey the feeling of displacement [related to her move from Korea to the US] and conformity by acting of walking."
Even knowing that she was walking backwards and reversed the video to achieve the end product, it is difficult to reverse the action in my mind's eye. It's slightly jarring, though interesting to note that nobody around her seems to take notice of her admittedly nonconformist behavior.
(Thanks to Glenn at Times Square Alliance for the heads up.)