After School Massacre (2014)

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Two high school students, head to the room of their senior year history teacher, Mr. Anderson to deal with a little problem. See, during class he confiscated a hat and they want it back, and on top of that, they’re upset that he hasn’t accepted their friend request! When he relents and accepts the request, those above him feel he’s broken professional protocol and he’s fired on the spot. He doesn’t take too kindly to this news, and reacts by killing both the principal who fired him and an innocent secretary, guilty of being in the wrong place at the wrong time.