Research into viral advertising

This is a viral advert for district 9, it features the outline of a prawn (the alien race in the film) with the restricted logo over the top of it. While this advert isn't for a relevant  film it is still a good example of  viral advertising. this is because the district 9 advertisers placed the poster somewhere that people would go every day and would probably see the same thing day in and day out so by changing the usual setting it forces people to take notice, and if it peaks then the advert was successful.