Addictive to Angry Bird?

Have you heard of Angry Bird? Burung Marah?? You could see them everywhere at the mall in terms of clothings, bags, pillows, toys, even Stationaries!! What really makes people so addictive to Angry bird? Even my 4 yeard old niece also knows what Angry Bird is. Untill my dad pun kena. "Angry Bird... Babai Bert" hahaha. Tak percaya?? Tengok Gambar...