There are sure to be a lot of people wearing Iron Man suits this Halloween. But you can make yourself stand out among the crowd by making an Iron Man Repulsor Beam that's controlled by muscle movement. With this costume, you can light up the Repulsor Beam by flexing your forearm.
This costume isn't for those looking to score something quick. You're going to need access to a 3-D printer. But if you can find one of those, this costume is guaranteed to get attention.