Inspired primarily by a sketch of stylized wingless birds, Angry Birds is a very popular puzzle video game.
It is best played on a mobile device (iPhone, iPad, Android, etc.) and is among the most popular of all mobile apps due to its successful blending of three powerful forces: addictive game-play, humorous style and reasonable cost.
Created by the Finnish company, Rovio Mobile and released for Apple's iOS in December of 2009, more than 12 million copies of the game have been sold via the Apple App Store, making this app a very lucrative addition to the company coffers.
The Window of the World Theme Park in Changsha, China has started its own spin-off of the game of Angry Birds and was so anxious to do so that it neglected to ask Rovio's permission.
Whoever started this infringement can be argued, but the Internet is now buzzing with users pelting plush toy birds with slingshots as they dish out revenge against the pigs' fortified castles.
It's the angry flightless birds against the evil green pigs protected by structures of wood, ice or stone on the playing field. The game gets more interesting as players advance, as new birds appear and some of them, if activated by the player, have special abilities.
The game has been so overwhelmingly successful that Rovio soon made adjustments to accommodate their windfall.
The app, which was originally developed only for mobile phones, was soon adapted to other touch screen-based smartphones and numerous free updates were also added as well as holiday and promotional versions of Angry Birds.
It is not known at this point what course of action Rovio will take against the infringement perpetrated by theme park.
One unnamed park official claimed that the game serves to help users gain happiness through purging.
Perhaps the powers-that-be haven't had a chance yet to look up from all the money rolling into their company!
Time, many more angry birds and executives vs. pigs will tell.