Bethesda let E3 attendees experience DOOM: BFG Edition via a virtual reality headset.
John Carmack said the kit reuses programming from his aerospace company, Armadillo. Players still have to utilise a controller, as the set tracks head movements only. It's thrown together from a ski mask and duct tape, and wasn't invented completely by Carmack himself.
The VR headset probably won't be landing in your local store soon, but could be available for around $500 if big-spenders want it.