Electrified laser defense system
This Portal Denial System was created by Ionatron and uses a laser-induced plasma channel to electrocute anybody that steps in its path. It fires a laser across an opening to create a conductive stream of plasma which acts as a virtual wire. Because the plasma is conductive, it can be used to fire a lethal or "less lethal" shot of electricity, electrocuting anybody that crosses the beam. Unfortunately, this thing is only authorized for sale to the US government. It's almost as if they don't trust people to install these things in their homes. Hey, I almost got my VCR working, so I'm pretty sure I can handle something as simple as an electrified laser beam. C'mon now!
A video of this monster in action after the jump.