http://www.thisiscolossal.com/2014/12/traffic-light-that-lets-you-play-pong-with-person-on-the-other-side-officially-installed-in-germany/
Yes...it exists. One was recently installed in Germany. It allows a pedestrian to play Pong with a ped on the other side of the street while waiting for the signal to change.
That's really cool. I'm not sure how successful it would be though. I doubt many people would be aware of that feature at that intersection.