Another Improv everywhere stunt (I highly encourage you to browse their missions on their site improveverywhere.com). This happened last summer where they decided to create a "tourist" lane and a New Yorker lane on the sidewalk off Fifth Ave.
The best part: NYers were totally surprised and accepting, tourists just assumed it was a crazy NY law. NY is different, people acknowledge that fact so they don't even question something as strange as a tourist lane.
Implication: Do something disruptive that New Yorkers will appreciate.