The QuadSki is a jet ski that turns in to a quadrunner at the push of a button. Here is a video of it in action.
Its suppose to travel up to 50 miles-per-hour on land or water, and its powered by a 140-horsepower engine. On a full tank of gas is suppose to have a 372-mile range on land or two hours of boating on the water.
I really want one... Now all I have to do is see if anyone will give me it for free.