Okay, so Halloween was like almost 6 months ago, but this dude’s costume is pretty slick. Using a portable DVD player’s screen hooked up to a video camera he was able to create the illusion of a gaping hole in his abdomen. It also doesn’t hurt (get it?) that he has largely used duct tape and cardboard, all cheap components for the DIYer.
Make this into a jacket and you’ve got yourself an invisible cloak.