A bike that just looks ... well ... wrong!

[al78]

[media]
]View: http://www.youtube.com/watch?v=0y3ffXKVFjo[/media]

The tandem for married couples who've had an argument?

 

[Globalti]

It's a pushme-pullu.

 

[MrRidley]

Here's a few other's a friend of mine makes including the back to back tandem, http://www.commonwheel.org.uk/johns-creations He makes loads of these in
his spare time, also check out the video's at the bottom of the page.