I wrote this one down back when I had it, it was so weird...
My dad and I are driving to my school because we need to talk to my technology-teacher. We get there and go down to the classroom, which is in a boilerroom (I normally have technology on the 1st floor), steam, red lights, etc. My dad and I go into the classroom and wait, and all of a sudden we're in the middle of class. My teacher is getting more and more frustrated, and finally he shouts that he wants to kill himself and runs out of the room. Shortly after, he comes back wearing an evening gown, and with makeup in his face. He is wearing a patch on one of his wrists and you can see the blood tickle out from underneath.
He then starts killing people, and my entire class becomes faceless and I can't tell who's who. Then the view changes to another room in the boilerroom, where I see a manequin sized puppet come to life. It's dressed in black, and pulls a piece of cloth from its back, over its shoulders, and in mid-air, the cloth turns into an uzi. The puppet then comes smashing into the classroom where my teacher has disappeared. Everything goes into slowmotion, and the puppet starts shooting. It makes perfect one hit kills, no one is shot twice, despite it using an uzi.
The puppet then evaporates as the door is kicked in anew, and then I walk in, wielding a knife. I look at the seat where I was sitting just a second ago, and it's now empty. I start killing people, and I see a woman lying on the floor and I think "Kill the bitch!". I kill her and when I look up, a man is sitting at the other end of the room, I throw the knife into his chest.
Then I wake up.