Why are these birds angry? Well, because the pigs stole, fried, and ate their eggs, of course.
If this sounds like a really sick variation of the old Why did the Chicken Cross the Road jokes, it's not. There's a game that is becoming very popular on the social networks, called "Angry Birds." I ignored it as long as I could, but I finally had to know what the fuss was all about.
In Angry Birds, players take control of a flock of birds that are attempting to retrieve eggs that have been stolen by a group of evil pigs. On each level, the pigs are sheltered by structures made of various materials such as wood, glass and stone, and the object of the game is to eliminate all the pigs in the level. Using a slingshot, players launch the birds with the intent of either hitting the pigs directly or damaging the structures, which would cause them to collapse and kill the pigs. In higher stages of the game, additional objects such as explosives and rocks are found in the levels, and may be used in conjunction with the birds to destroy hard-to-reach pigs.