So Halloween has come and gone. I thought it would be fun to look back at some of this year's, and the previous year's top 8 geekiest but coolest Halloween Costumes. 8. Darth Vader Supreme Edition Costume This is an oldie I know, but always a goodie. Besides, this is the supreme edition! 7. Facebook Costume Ok, it's really simple, but I think they nailed it and who doesn't love Facebook 6. Metroid Costume This one's a bit old, but if you're like me there's a ton of nostalgia in this character and the chick wearing it ain't half bad. 5. Kid Megaman Costume (DIY) This one floated around on the Net this past October. It's pretty bad ass, although I'm sure the kid has no clue who Megaman is. 4. Optimus Prime Transformer Costume The movie came out last year and it was a bit disappointing. This costume on the other hand, was not. The thing actually transforms with a guy inside. 3. IronMan Costume This thing is pretty dead on with the exception that it's plastic and not metal sheeting. Tony Stark would be proud 2. Tron Costume (DIY) The guy who made this isn't exactly the pinnacle of fitness, but the costume is sick and even features glowing tubes for that complete Tron effect. 1. Master Chief Halo Costume Looks real and rugged and that's what counts. Sure it's $600, but what's money when you have authenticity.