This has to be the coolest thing I will see today. I need at least two to stand guard by my apartment.

Not only does this currently uncased Portal turret track its victims with a camera, but it can even shoot (non-lethally) at them. And it'll inquire after you if you've left its sights. The only thing left for this Penn State University student is to create a stock of them so they can sing in unison. How cool would that be?

Real Tracking and Shooting Portal Turret [YouTube via Reddit]