Cryolator (Fallout 3)

The Cryolator was an energy weapon from Fallout 3. It was meant to freeze people, and could be built by the player with the proper schematics and parts. It was cut from the final version of the game for unknown reasons. It is still contained in bsa files but is simply not used. A mod makes it available.

http://www.youtube.com/v/MJ0t82VBTSI&hl=en&fs=1