More than 20 people were injured at a "G in the Cloud" event in South Korea, after people were offered the chance to win a phone by shooting down a balloon.
Several people turned up with BB guns and one even showed up with a knife on a stick. Carnage ensued.
Watch it here http://youtu.be/AWewOTjaef8
I think we should see more of this sort of marketing. It's a great way of getting rid of the sort of people who turn up to public events with a knife on a stick.