As some of you know, NVIDIA's New GTX 700 series card will be coming out soon. At CES, NVIDIA representatives announced that they are developing 4D Gameplay, where the player feels what is going on. NVIDIA's technology will be a device that will connect into you back on your spine, and send electrical signals through your nerves to replicate the sensations of real life.
An example of this would be pain. If an enemy stabs your player's character, NVIDIA's 4D device would send signals through your nerves into the area on the players body where the Video game character got hurt. It would not be the full amount of pain as in real life, but a short pinch. Another example would be Gun Recoil. The device would make your overall body have a slight twitch, for the effect to be somewhat realistic.
May Fools!