I've heard more than one New Yorker wish that tourists on sidewalks would either speed up or get out of the way. Improv Everywhere ran with this idea and spray painted actual traffic lanes marked "New Yorkers" and "Tourists" on a section of sidewalk. Then the pranksters tried to enforce them.
It took four days for municipal maintenance workers to remove the lanes.
New Yorkers, would you like to see carried out officially?
via Urlesque | Official Website
Previous Improv Everywhere Pranks:
Food Court Musical
Ghostbusters in New York Public Library
Frozen in Grand Central Station
Mobile Desktop Prank