taking a revenge - Maybe you have seen how a bird was treated by a cat if the former was locked in the cage.It is no doubt that the cat will be looking very anxiously to the bird from time to time,just like a hunter meets his prey.Then just imagine,if one day,the bird is free,and the cat is locked instead,how do you think it will be? Will the bird gonna treat the cat in the same way? I think he can not,but does he feels good?Then,if this gonna happen to the human world,can you guess what happen next?