Not to take away from the brilliance of this, but is it actually a good idea to encourage people to pee as hard as possible each time they use the restroom?
...or to wave it around all over the urinal whilst trying to clean virtual graffiti? Seems like you could turn something like this http://www.toiletmarksman.com/toilet_fly.php into an ad platform too and keep the floor and surrounding walls a little cleaner.