To maximise the social media hype ahead of Stars Wars: The Last Jedi, we bought a selection of influencers actual stars of their own. Then we paired them off against one another in a loudly hashtagged battle, with the victor winning tickets for their fans to the premiere. The results? 60% engagement from the (unpaid!) influencers; epic reach; and an ROI of about 1300%. Cheeky it was. Effective it was.