Yamaha XTW250 Ryoku Concept Bike. Had lots of interesting features. Of the ones I can remember, it had a skid plate that detached for use as a shovel (it even had a handle) , an onboard power generator, and quite a few other things that escape memory at the moment. There is a thread on here about it, and it links a lot more pictures of the features. But alas, it never came to be.