attack teacher

Wow...that's crazy. I often hears junior high or high school students get trouble with there teachers, but 3rd graders... never heard of it. And I'm surprised that they are so prepared for this action. First of all, how do they learned this kind of thing? Knocking her out with a crystal paperweight holder, handcuffing the teacher and then stabbing her with the knife? How the hell these 3rd graders came out with this thought? May be it is bad influence from movies or video games. But whichever, there parents and teachers must watch there children more carefully.