If you've been reading Complex over the past week we've hipped you to the Most Controversial Costumes of 2011, the 25 Halloween Costumes That Will Get You Laid, the Most Offensive Costumes ever worn, the 50 Hottest Celebrity Halloween Costumes, and the best Last-Minute Halloween Costumes. We repped for everyone except the geeks. 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 characters, with homemade special effects that rival anything Hollywood can produce. In preparation for all the big day, we've put together this list of some of the most insane high-concept, geek-tastic costumes ever made.