What if you could high five someone in Amsterdam, standing in New York? KLM installed an interactive system which connected hundreds of people in Amsterdam and New York through a 'live high five'. For one day only, citizens could win a return flight to Amsterdam and New York just by high-fiving at the exact same time. By connecting hundreds of people face to face across the ocean, KLM gained invaluable coverage for the price of a few economy tickets.
Taken from Digital Buzz Blog.