Human powered hydrofoils
http://www.google.com/search?q=human-powered+hydrofoil&sourceid=mozilla-search&start=0&start=0&ie=utf-8&oe=utf-8
http://www.gizmodo.com/gadgets/gadgets/vehicles/pumpabike-humanpowered-hydrofoil-104726.php
Motorized unicycle
http://www.techtv.com/inventthis/inventors/story/0,24330,3542721,00.html
Unicycle physics
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