So I've had this idea mulling around and while I doubt I'm the first one to think of it, I would love to see it built.
Basically you take 2 tandems side-by-side and weld cross bars to connect them, making a 4 person bike in the least aero fashion, then attach a large trailer to the back that isn't actually capable of holding anything. Finally, you replace the front hubs with generator hubs that power DVD players mounted to the rear of the front seat posts.
The only problem I can think of is turning, you need a way to force the inside wheel to turn less than the outside wheel. I'd really like to keep it a 4 wheeled bike, so a trike is out of the question. Does anyone have any ideas? Also I have no way of doing this, but if someone can pull it off I'd probably poop my pants.
Oh yeah, those DVD players will only be capable of playing bike porn.