Ghost of a flea

If you like this, you may also like this An old school Monocycle. I love the 'Professor Pat Pending' look of the driver.

It seems there's a long history of people strapping an engine to one wheel though. Witness this slide show and this modern example.

These look like they may be production models. Whilst this lot are very definitely home made.

Even the virtual domain is not free from this one wheeled lunacy.

I expect you'd prefer it if they were steam powered though :)

I cocked that last link up.