Half of a Smart car......

Top Gear does a few segments on those 3 wheelers, Reliant Robins I think, heck they even tried to shoot one into space.

[ame="http://www.youtube.com/watch?v=QQh56geU0X8"]Rolling a Reliant Robin - Top Gear - BBC - YouTube[/ame]

[ame="http://www.youtube.com/watch?v=_b4WzWFKQ20"]Top Gear - Reliant Robin space shuttle - Richard Hammond and James May - BBC - YouTube[/ame]