Dream of movie

I was in a college course and we were watching a movie. I kept trying to find a new seat, and the class was very full. But it wasnt a real classroom, it was a more like a giant living room with recliners. I tripped on some students, but they didn't get angry. After the movie was over, I was going to leave, but one of the other students wanted to know if he could drive my car, I said yes. He left with my car and didn't come back. I was very upset, and tried to call him, to tell him I would call the police if he didn't come back. While i was upset, I kept feeling like there was something coming out of my butt, like a long string of hair. I couldn't get it out. Eventually, he came back with my car. I was very upset, but then he got very upset and showed me what he did to another student. He murdered another student and peeled the skin off of the students face with a cheese grater. I left very nervous, and was afraid because this murdering student knew where i lived. Later, I was at the teacher's house to warn her, and the murdering student showed up at her house dressed in drag as a maid. I tried to save the teacher, but then another murderer showed up and tried to get me. I pulled a knife from the teachers kitchen, and the the murderer tried to hit me with a hammer. I chopped him in the neck. My weapon turned into a large hook. I stuck the hook into the murderers neck, killing him. The murdering student had killed the teacher, but called the police, so it looked like I killed the teacher and the other murderer.