Trendwatching.com: In November 2010, Dutch airline KLM ran an experimental campaign called How Happiness Spreads, where it employed a “Surprise Team” to give passengers tailored, unexpected gifts at the airport.
Combining with location-based game Foursquare, as soon as someone checked-in at a KLM Foursquare location within its network of airports the Surprise Team went online to find more background information about the person, decided upon a suitable gift and gave it them before they flew.
For instance, one traveler tweeted he would miss a PSV Eindhoven football game while he was in New York. The Surprise Team, accordingly, gave him a Lonely Planet guidebook of NYC with all the football bars highlighted in blue.
Random Acts of Kindness [Trendwatching.com]