Uno motorcycle (http://gizmodo.com/384074/uno-a-unicycle+motorbike+segway-hybrid).
A while ago a friend/colleague of mine and I did some concept work in the moto industry. For sh*ts and giggles we played around with the idea of a one wheeled motorbike full of gyroscopes like a Segway (http://www.segway.com), and eventually made a concept bike (Ducati branded of course). Well, some 18 year old made one it looks like. Ass ugly, but they say it works.
(http://gizmodo.com/assets/resources/2008/04/Unobike1.jpg)
Does that count as a wheelie?
Looks like it can high-side at 5 mph.
Looks like you might fall forward if you downshift, oh wait, would that be a stoppee? [laugh]
Did I just click on a time machine? Did we just roll over to a fresh 2008? What wonders does this year hold for us!? [laugh]