The always-good GOOD magazine has a short list of unusual nudges to get people to do the "right thing," from reducing teenage pregnancy to quitting nail biting. From GOOD:
Stop men from peeing on the floor.
Authorities at Schiphol Airport in Amsterdam have etched the image of a black housefly into each urinal. It seems that men usually do not pay much attention to where they aim, which can create a bit of a mess. But if you give them a target, they can't help but try to hit it. Similar designs have been implemented in urinals around the world, including mini soccer goals, bulls-eyes, and urine video games (seriously). Do they work? Since the bugs were etched into the airport urinals, spillage has decreased by 80 percent.