I've got nothing this year, unfortunately. Too broke. Last year I just tried to make something scary out of whatever I could find lying around my dorm room, which ended up being my To The Ark mask (that is way too small for my face), a hoodie which I used to cover up my face that the mask didn't cover, and I fashioned my blanket into a cloak type thing. It was actually kind of creepy according to some people just because our floor in the dorms had a lot of the lights covered and was really dark. The year before I was a semi-colon.
One of my friends is dressing as the Earl of Lemongrab from Adventure Time, which should prove pretty funny.