Soloing a tandem canoe.

Here's one way...

http://www.youtube.com/watch?v=H2M9jwKtMt0

Note that directional control is not dependent on wind or lack thereof - or any wild flailing with the paddle. You need a good canoe for this to work well. Coleman and Pelican barges need not apply.

My preferred method...

http://www.youtube.com/watch?v=nMxURxbzBWo

Note the deep water technique at about 3.07.

You can solo paddle from the stern seat pretty well if you have enough gear ahead of you to trim the boat level - but you'll need a lot of room to turn the boat. If you're on any sizable rapids, it's not a good position to perform a brace from or for any quick maneuvers. If you're on a calm lake though, no problem.

Lunatic fringe....we all know you're out there.