I love Marketing Stunts that get people talking. A favourite of mine is one that Uber did a couple of years ago. For one day in eight cities, you could hail a nearby icecream truck to your location. They rented a truck that went around handing out cold treats and then moved onto the next location. It cost Uber $2,000 per truck for a big payoff in terms of talkability.
I really liked the One Water campaign this year to raise awareness for the plight of consuming dirty water that faces millions of people around the world. They brought it to life in a really simple way through their packaging design.
Or Reeboks pop up gyms last year in South America.