Halloween is a time for people to throw their inhibitions to the wind and let their inner self out. We've seen people go in on the costumes, but there are a few hardcore devotees out there that create elaborate recreations of their favorite fictional characters, with homemade special effects that rival anything Hollywood can produce. And, yeah, we know this weekend proved to be the unofficial horror holiday as everyone dressed up, hit the streets, and got wasted. But in preparation for all the real big day, we've put together this list of some of the most insane high-concept, geek-tastic costumes ever made.