This mobile ad from Google, which re-imagines a classic Coke spot, has scooped the Mobile Grand Prix at Cannes. A digital reinterpretation of Coke's iconic 'Hilltop' spot, featuring the song "I want to buy the world a Coke", the mobile ad enables viewers to actually buy a Coke for someone in a city of their choice. As they watch the mobile ad, which ran on Google's Admob network, users can pick a city to send the Coke to, attach a text message and press a button that dispenses a drink at a specially designed vending machines in that city. The viewer can even watch as their Coke is delivered. The ad was created as part of Project Re:Brief in which Grow Interactive and agency Johannes Leonardo reimagined classic ads with a digital twist for the modern day. While Google commissioned it, Coca-cola also signed off on the ad. For more on the effort and Cannes judging, check out all our Cannes 2012 coverage.