After School Massacre (2014)

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 reacts to this news by killing both the principal who fired him and an innocent secretary guilty of being in the wrong place at the wrong time. Meanwhile, Jess gathers her friends for a sleepover. She talks to her mom about it and sets about making plans, but there is one minor caveat: the last time she had a sleepover, one of her friends overdosed and died. Obviously they'd like to avoid anyone dying this time around, but with Anderson now on a killing spree, that might be tough to avoid. You'd think Mom would know how many teenage girls are running around her house in their underwear (much to the delight of some booze-swilling peepers just outside the window), but a hunky guy named Steve is keeping her far too distracted. The cops are soon on the case, but with Anderson's psychotic rage reaching a fever pitch, it might be a case of too little too late.