Check out this awareness campaign from UNICEF called Dirty Water. The challenge was the shock the public enough to spread the word about 4,200 deaths of children due to water-related illnesses every single day.
“With 0$ budget, we had to create mass media exposure alarming New Yorkers about the thousands of children dying daily from a lack of clean water, and the urgency to help with donations to UNICEF.”
Passersby could donate in the vending machine or via their mobile using SMS.
Great campaign, they even managed to hit the news.