I am no expert on vibrating gaming chairs. I'm certain they've been shaking players for years. Here's one, called Game Chair, that we saw at the Tokyo Game Show. Witness this novel, yet disturbing, demonstration of its vibrating abilities.
UPDATE: Sharp-eyed readers note that we are seeing the balls bounce on what would be the back of the chair. So, less cause for alarm. Still, an amazing demonstration of vibrational abilities!