Wow. I really want to take the Autocanoe for a spin! It's part canoe, part something else, and it's amphibious! Technically speaking, they call it a Pedal Powered Amphibious Recumbent Tricycle and a Roadable Pedal Canoe. Take a look at the Autocanoe in the water:
And on land:
You can't buy a completed Autocanoe, but you can buy plans to construct your own for $40.