A clever fusion of horror fandom and commerce helped Uber Eats conjure its most successful grocery campaign ever - one terrifying puzzle at a time. Read and watch in our Global Ads Spotlight column. https://www.storyboard18.com/advertising/global-ads-spotlight-how-uber-eats-turned-boring-promo-codes-into-a-halloween-horror-hit-69270.htm?utm_source=WA&utm_campaign=06