The mobile game Angry Birds cost €100,000 to make, and has generated more than €50m in revenue

"Angry Birds is the first waste of 75 millions people's time that can be accurately quantified. Every day, users spend 200 million minutes -- 16 years every hour -- playing the mobile game. Three trillion pigs have been popped. It has filled billions of those interstitial moments spent riding the bus, on a plane or in important work meetings, and it is or has been the number-one paid app on iTunes in 68 countries, as well as the best-selling paid app of all time. It went straight to the top of the new Mac App Store in January, selling 150,000 copies in its first week. Sixty thousand Angry Birds soft toys have been sold. In January, the trailer for the new Angry Birds Rio racked up 500,000 YouTube views in a weekend; on official videos alone, Angry Birds has had 27 million total views. In total, the "brand" has taken more than €50 million: not bad for a game that cost €100,000 to make. On the first anniversary of its release, 2,405 people in 756 cities worldwide wasted even more of their time holding events in celebration of "Angry Birds Day"."
Source:  Wired UK, 7th March 2011