An obscure peripheral, this one:
Video game characters live in a three-dimensional world, but gamers have only been able to experience two dimensions... until now. The 3rdSpace® Vest from TN Games takes gameplay beyond sight and sound, creating spatial awareness of the world your characters inhabit. Unlike traditional force feedback devices that rumble or buzz, the 3rdSpace Vest gives you precise impact where it happens, as it happens. Get pounded with body slams, crushed with G-forces, and blasted with bullet fire.
It could add to the whole general excitement. Combined with a lightgun, you could get a whole-body workout with the ducking and diving. And with two, you could hurt your mate in a multi-player show-off. Wouldn't that be nice.